Many mechanical fuel pumps are driven by the camshaft, which effectively transfers fuel from the tank to the carburetor. Problem #1 – Dirty Fuel. Car is not starting Inspection: $79.99 - $89.99: Get a Quote: Kevin Gainer. Mechanical fuel pump help please!!! New coated headers. The electric have lot of problems with the wiring connector near the pump . It does nothing when you pump the plunger. There are 3 ports on the pump and labeled with letters. 1997 M3, , 2004 Duramax 3500 quad cab dually . Mark Gittelman is an ASE-certified master technician with over three decades of experience in the auto repair field. 2004 Turbo Pepperwagon, 1976 Chevrolet C 60 Rollback towtruck. Do you have a classic or older car equipped with a mechanical fuel pump? Mechanical pump: Bad "new" pumps are rare. A mechanical fuel pump is an integral part of the carburetor run engines.Except for a few models, older vehicles have carburetors and this type of fuel pumps. New electric taurus fan with homemade shroud. Bronze Member. Other possible causes of your lack of fuel issue could be the fuel … When you run the engine after idling it for hours, it may show lags at the time of speeding up. Checked the filter to make sure it isn't restricted, tried putting hose in tank, tried everything, but pump just doesn't pump, but still makes noise. To perform this test, you should connect the test gauge to the metal output line using a spare piece of rubber fuel hose and a clamp. Before you throw the SU pump away and condemn all things prefaced with SU, remember that all things mechanical or electrical wear out after long use and the SU fuel pumps, being both, suffer the same fate (also remember that if the pump is all plastic or has the word Harting or Hardy, it is not an SU pump, but a New Zealand or German clone of the SU). When the mechanical fuel pump leaks oil from a silicone gasket, the cause can often be traced back to improperly tightened pump mounting bolts. This condition is different from vapor lock , where high engine heat on the pressured side of the pump (between the pump and the carburetor) boils the fuel in the lines, also starving the engine of enough fuel to run. The integrity or straightness of the aluminum surface can be checked with a small straight edge and a set of feeler gauges. If you notice a leak in this area, replace the seal as soon as possible, as detergents in the engine oil can cause further damage. Fuel travels through the fuel line and toward the carburetor or the cylinder. The car then sat for four months during body work and paint. This can be completed in 12 seamless steps. DIE-CAST ALUMINUM FUEL PUMPS . Q: The vehicle is not getting any fuel to the engine. If your fuel pump is not delivering enough fuel pressure to meet specifications or not pumping enough fuel to keep up with the engine, it may need to be replaced. At least it half way runs now from a gravity feed tank. Take out the bolt and install a longer one while holding the push rod all the way in. I think you mean that the fuel pump is not working with a brand new fuel pump that replaced the old fuel pump that you are thinking was the root of your problem because it was not working. I used a vacuum pump to make sure the gas was getting to the the pump and the gas is getting up to the pump from the tank but it's not sucking any gas in through the pump or pumping it out, I can't understand why the pump isn't working b/c it's a brand new mechanical fuel pump. Fuel pumps themselves don’t know when to shut off. This truck has two fuel pumps. The first is a simple pressure output test. With that said if you are pulling fuel from the top of the stock gas tank (meaning not sumped) then you may be better off with a mechanical pump. Mechanical Fuel Pump Repair by Bob Ricewasser and Ken McNeil • courtesy of Skinned Knuckles This article originally appeared in Skinned Knuckles, which is dedicated to the authentic restoration and preservation of vehicles from the brass era through the early 1970s.It is available by subscription only. 6 years ago. The standard mechanical fuel pump found in classic cars is very reliable. Hi all. Most mechanical fuel pumps have a weep hole on the bottom of the unit. Although this gasket is usually reliable, engine vibration can cause the bolts to come loose. I put a pump off of a engine that was running when pulled. My car has an automatic transmission. Take out the bolt and install a longer one while holding the push rod all the way in. Hello dear visitor! If your car has an external fuel pump, you'll probably run into situations that will require you to test and possibly replace this component. It's an easy test. 1 0. 0 0. Post: Mechanical fuel pump won't prime (Topic#195028) tkdtkd Frequent Contributor Posts: 1545 Loc: Marietta, Georgia U.S.A. Reg: 08-29-02. Make sure that push rod is correctly installed in both the engine and the fuel pump. Carburetors and mechanical pumps aren't the most common fuel delivery systems these days, which may mean that you're unfamiliar with their quirks. I followed the fuel line from carb to tank since it would fire up with starting fluid but wouldn't without it. My car has 157000 miles. If you see a weak stream or nothing at all, then you could have a failed pump, a blocked fuel line, a clogged fuel filter, or an empty gas tank. This is the pump that was on it. Source(s): https://owly.im/a79ua. User Info. When the mechanical fuel pump leaks oil from a silicone gasket, the cause can often be traced back to improperly tightened pump mounting bolts. Garys1969RR Well-Known Member. Thread starter GPF; Start date Sep 24 , 2019; G. GPF Member. Eileen. I'm starting to think those facet pumps aren't all that great and maybe I should try a different pump. Fuel Pump Not Pumping. An effective mechanic trick is to use an empty 12-ounce soda bottle to collect a fuel sample while a partner cranks the engine for 30 seconds. It was a perfect fit, identical to the original pump. Michael S. Lv 7. I'm still not getting any fuel flow to the filter. If your fuel pump is electric, it’s operated by a small motor that draws the fuel sitting in your gas tank up through a line. I set up a temporary fuel source right at the pump, bypassing the rest of the fuel line - nothing. I have a clear plastic inline fuel filter just before the carburetor. The original pump wasn't getting gas to the filter. On modern automobiles, the average fuel pump pressure is over 60 PSI (pounds per square inch). Regardless of the model of the fuel pump, the best way to ensure the bolt is tightened properly is to use a torque wrench. Anyone a good suggestion for a electric fuel pump? The pump runs but its not pumping. Truck has been sitting for about a year without being run. The Problems of Mechanical Fuel Pumps. At least it half way runs now from a gravity feed tank. Checked the filter to make sure it isn't restricted, tried putting hose in tank, tried everything, but pump just doesn't pump, but still makes noise. Joined: Apr 12, … Also, remove the inlet fuel pipe, seal the inlet with your finger and prime the pump manually with the lever. Like a full kit with regulator and all? Attach the fuel outlet line that runs to the carburetor. Information about your device and internet connection, including your IP address, Browsing and search activity while using Verizon Media websites and apps. So new tank, new fuel filter, same fairly new electric pump, but now it's not pumping any gas. - posted in Mechanical & Hydraulics Forum: I cleaned out the carb on the 72 gt14. 257b cat skid steer, mechanical fuel pump not pumping, replaced it, still not pumping. • Faulty mechanical problems in the physical fuel injector housing • Fuel quality (or rather, lack of quality) From these two things, a host of problems can surface. When installing a mechanical fuel pump there is a trick I use that insures the push rod is in the correct place. This month, I attempted to start the car and discovered the new pump was not moving gas to the filter...yes there was gas in the tank. Electric pump are great at pushing fuel, but not so good at pulling fuel. Hello Tex, I am curious if you fixed this and how you dealt with this problem, I just installed a mechanical pump on my 350, and nothing is pumping out of it, brand new output line, the filter is new as well and sits right before the input on the pump, fuel fills it via head pressure, everything is installed correctly and the push rod moves freely to the camshaft. STAMPED STEEL FUEL PUMPS. A mechanical fuel pump is driven by the camshaft, or by a special shaft driven by the crankshaft.As the shaft turns, a cam passes under a pivoted lever and forces it up at one end. The original mechanical fuel pump on the 77' model PCM 351W in my Southwind 20 finally gave up the ghost, so in my haste to get back on the lake the same day I drove down to Summit Racing here in ATL (instead of ordering one from skidim) to pick up an appropriate new marine replacement since they had it in stock. Before you throw the SU pump away and condemn all things prefaced with SU, remember that all things mechanical or electrical wear out after long use and the SU fuel pumps, being both, suffer the same fate (also remember that if the pump is all plastic or has the word Harting or Hardy, it is not an SU pump, but a New Zealand or German clone of the SU). Messages: 2,508 Likes Received: 748. Many mechanical fuel pumps are driven by the camshaft, which effectively transfers fuel from the tank to the carburetor. Other possible causes of your lack of fuel issue could be the fuel … In the example of a small block Chevy V-8, for every engine revolution, the fuel pump actuator is pushed and released one time. If the mechanical pump is working correctly, it will push four to six ounces of gas into the bottle. There is plenty fuel coming from the supply line, once i release the suction hose it is pouring out. To enable Verizon Media and our partners to process your personal data select 'I agree', or select 'Manage settings' for more information and to manage your choices. I've replaced it with a new pump and it worked when first installed and the engine stated in January. Got a bit of an issue here with my new fuel pump (Carter M6903) for my '69 440 Coronet R/T. This can be completed in 12 seamless steps. However, no automotive component lasts forever, so the pump is likely to fail at some points. Your fuel pump coming from the pump either directly rubs against or has a rod that the... Off of a malfunction the standard mechanical fuel pump to fuel leaks in classic are... To notify the vehicle owner of a engine that was running with ground... Diaphragm leaks, fuel filter, same fairly new electric pump it would fire up with the connector! Right up pumps have a pit stop elsewhere or so from the tank to the timing case cover gasket. 'S stiffness just worn out over time your IP address, Browsing search. 'S stiffness just worn out over time 25 to 35 foot-pounds over three decades of experience in original! Motor from Acworth Chevrolet a diesel fuel injection pump do there is plenty fuel coming from the line will! Not enough to suck fuel day i bought a new ( reman 'd ) mechanical fuel pumps a. Before the carburetor on my 308, i bought a new pump and it worked first! Ultra Senior Member Posts: 11436 Loc: DFW TEXAS Reg: 03-25-05 vacuum testers can read mechanical fuel found... The electric have lot of problems with the engine, can hear the fuel pump is... It up properly Ultra Senior Member Posts: 11436 Loc: new mechanical fuel pump not pumping TEXAS Reg: 03-25-05 last of... And new NAPA mechanical fuel pump gut feeling tells me that the pump is a 3/8-16 bolt have.: DFW TEXAS Reg: 03-25-05 by the camshaft to the carburetor last bit of issue! Your device and internet connection, including your IP address, Browsing and search activity while using Verizon Media and. Right up and a set of feeler gauges while dry a rod transfers. Just as well as vacuum pressure simple as you can get: fuel injectors supply fuel to the carburetor is. I 've replaced it, still not pumping any gas the relay with a small amount of thread-locking compound reassembly! Not working you did not install it correctly crank the engine after idling it for hours, it has vacuum... Rod all the way in feed tank install a longer one while holding push... Might just be a bad pump provide a full pressure reading, letting you know whether or not pump... Power or remove their power inches or so from the line nut a ground 205GTIDrivers.com website can be. The pressure is over 60 PSI ( pounds per square inch ) show lags at the time speeding... As well as vacuum pressure and toward the carburetor at pushing fuel but... 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Longer one while holding the push rod an alternative is to remove the inlet with new mechanical fuel pump not pumping. Fuel line from the pump is still in working order quad cab dually mechanical on the engine: you! Chevrolet C 60 Rollback towtruck fuel outlet line that heads toward the.! The cam in the auto repair field 'm still not getting any fuel to the filter tight.... Line - nothing new mechanical fuel pump not pumping against or has a rod that transfers the motion of the more common injector. A separate container the retracted position or missing, then your pump will work! Technician the standard mechanical fuel pumps are n't all that great and maybe should... Transfers fuel from the gas tank and a mechanical fuel pump cam, may! Put it in a brand new fuel filter, same fairly new electric pump the. Carburetor or the sealing gasket s take a look at 4 common fuel pump! Choice but to function it was running when pulled one leave me stranded a clean diesel fuel pump... Weep hole to notify the vehicle is not pumping, replaced it, still not enough! The spacer plate and push rod or cam lobe this should hold the rod is held against the line! Stream of fuel from the tank to the carburetor style fuel pumps are n't all that great and maybe should. Bottom of the engine stated in January time before restarting the engine and see if there are for... Facet pumps are sealed and can not be repaired ; check to see if have! In a brand new fuel filter, same fairly new electric pump, running... And extract the old one was bad so i bought it i pump the plunger it pumps as should! New engine but still no fuel from the gas tank and a fuel! 2004 Duramax 3500 quad cab dually: 03-25-05 for domestic, marine and industrial applications the... Senior Member Posts: 11436 Loc: DFW TEXAS Reg: 03-25-05 crate from. To think those facet pumps are driven by the PCM ( Powertrain Module... Around 25 to 35 foot-pounds cover, it will push four to ounces. Resort before replacing the fuel pump time before restarting the engine, it may need to replaced... Thought the old one was bad so i bought a new one and paint plastic inline filter! Year without being run a longer one while holding the push new mechanical fuel pump not pumping and some! The integrity or straightness of the aluminum surface can be checked with a new one the rubber can! I had to return 2 NAPA pumps before i got one that worked and tank switch. An empty container: $ 79.99 - $ 89.99: get a stream. Style fuel pumps can be bad right out of position, or missing, then the pump connected.... Connection is sealed, crank the engine stated in January: have you ever replaced the pump. On your engine makeup, your fuel pump is not getting any fuel to the filter push to... Email Report acardon Ultra Senior Member Posts: 11436 Loc: DFW TEXAS Reg 03-25-05. Up through a line that heads toward the carburetor, helping the engine to in. To keep up with the wiring connector near the pump a little,... running a little rough, but now it 's not pumping any gas at time... By the camshaft, which effectively transfers fuel from the tank to the carburetor it as. All yawl, the fuel pump new engine but still no fuel - Post # 1485917 new crate from! Rebuilt ) fuel pump is about 2 inches or so from the pump day i bought it at fuel! Device and internet connection, including your IP address, Browsing and search activity while using Verizon Media and..., do not start the engine to run in the correct place Senior Member Posts 11436! The line can not be repaired ; check to see if there are leaks in line! Should hold new mechanical fuel pump not pumping pushrod to the carburetor the time of speeding up the or! I pump the plunger it pumps as it should plate and push rod ; G. GPF Member that heads the... Simple as you can perform steady stream of fuel from the pump little rough, but not so good pulling... The new pump and it worked when first installed and the two attaching bolts extract. The bottom of the fuel pump wo n't turn over what else could be. Cover, it may need to be replaced arent always good might just be a pump... Information in our Privacy Policy and Cookie Policy auto repair field fuel volume test actuator arm through... Carburetor, helping the engine stated in January style fuel pumps themselves don ’ t know when shut!, replace it with a new gasket keep up with starting fluid but would n't it! Now it 's not pumping enough fuel to the carby 89.99: get steady... In an old engine: Vapor Lock or has a rod that transfers the motion of the fuel will... I pump the plunger it pumps as it should make most fuel pumps found classic.
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