Post: Mechanical fuel pump won't prime (Topic#195028) tkdtkd Frequent Contributor Posts: 1545 Loc: Marietta, Georgia U.S.A. Reg: 08-29-02. Detach the fuel line from the carburetor and put it in an empty container. It's an easy test. I installed a new fuel pump yesterday on my 1993 maxima,I can hear the pump run but Im not getting any pressure.I checked the pressure on the hose coming from the fuel tank before it enters the fuel filter and theres no fuel in the hose and no pressure. My gut feeling tells me that the pump is running backwards,even though Im 100% sure I have the wires connected correctly. Make sure that push rod is correctly installed in both the engine and the fuel pump. Mechanical Fuel Pump Not Pumping. I followed the fuel line from carb to tank since it would fire up with starting fluid but wouldn't without it. The fuel pump relay is controlled by the PCM by providing the relay with a ground. kimberacp Trail Leader; Posts: 277; Joined: Oct 19, 2005; Logged; Re: mechancial fuel pump not sucking Reply #2 – Thursday, Jul 07, 2011, 11:59 AM. 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. This is the pump that was on it. I used at least a gallon priming the carb and new NAPA mechanical fuel pump won't prime. 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. With the gasket on the fuel pump insert the fuel pump arm into the hole in … Pressurized fuel … When the correct length fuel pump push rod is held against the fuel pump cam, it has no choice but to function. Do you have a classic or older car equipped with a mechanical fuel pump? Scouring pads can remove the soft aluminum material, creating an uneven surface. When I pump the plunger it pumps as it should. Since the metal tube is exposed to the elements, it's not uncommon for it to become rusted through to the point that the fuel is leaking out. On modern automobiles, the average fuel pump pressure is over 60 PSI (pounds per square inch). It's a brand new one. In older vehicles with mechanical fuel pumps, the pump moves as your camshaft spins and fuel is drawn through a line using suction. I have a clear plastic inline fuel filter just before the carburetor. The fuel pumps found on classic cars are highly reliable. 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). LiveAbout uses cookies to provide you with a great user experience and for our, How to Test the Vacuum Advance in Classic Cars, A Step-By-Step Guide to Replacing Your Car's Mechanical Fuel Pump, Engine Vacuum Leak: Symptoms and Solutions, Finding and Fixing an Evaporative Emissions Leak, How to Prevent Your Classic Car From Overheating, Two Reasons for Rough Idling on a Ford Focus, Engine Coolant Leaks: Symptoms and Solutions, How to Inspect and Test Your Fuel Pressure Regulator. Mechanical fuel pump help please!!! New coated headers. As far as I know this is stock setup. If fuel is dripping, the diaphragm is faulty and you need a new pump. Common rail high pressure pumps £35:00 Rotary type injection pumps (used on vehicles from the 1940's up to 2006) £50:00 Inline type injection pumps (used on vehicles from 1940's up to 1999) £80:00. 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. Using a vacuum pump and pull the fuel through the pump and filter also shows plenty fuel … 1 0. I set up a temporary fuel source right at the pump, bypassing the rest of the fuel line - nothing. Usually if it is not working you did not install it correctly. When this happens, oil can seep out around the fuel pump. Nevertheless, nothing automotive lasts forever. 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. Then crank the engine and see if you get a steady stream of fuel from the line. The integrity or straightness of the aluminum surface can be checked with a small straight edge and a set of feeler gauges. Many mechanical fuel pumps are driven by the camshaft, which effectively transfers fuel from the tank to the carburetor. When the internal diaphragm leaks, fuel escapes through the weep hole to notify the vehicle owner of a malfunction. It's a mechanical fuel pump. (1) 1 product ratings - Genuine High Pressure Fuel Pump for PSA Citroen Peugeot 1.6, 1920LL 9819938480 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. There are several best practices to follow when replacing the fuel pump or the sealing gasket. 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. I had to return 2 NAPA pumps before I got one that worked. Find out more about how we use your information in our Privacy Policy and Cookie Policy. New Fuel Pump - Not Pumping Through Lines? Although this gasket is usually reliable, engine vibration can cause the bolts to come loose. Since I wanted it to run in the original way, I bought a new mechanical fuel pump, which is not OEM probably. It was a perfect fit, identical to the original pump. To make sure the bolt stays in place, apply a small amount of thread-locking compound before reassembly. Where the fuel pump mounts to the timing case cover a gasket provides a tight seal. Got a bit of an issue here with my new fuel pump (Carter M6903) for my '69 440 Coronet R/T. New Mechanical fuel pump engine code R9M414 with part number 167008960R months of warranty 12 mo., year of construction 2016, classification code N1, type of engine Diesel Common Rail (Turbo), engine capacity 1,600 cc, brand of part BOSCH offered by Gebr.Klein Gunnewiek Ho.BV … This can be completed in 12 seamless steps. There are 3 ports on the pump and labeled with letters. If fuel spurts out, there is a carburettor fault (See Checking and cleaning an SU carburettor).If no fuel, or only a dribble, emerges, either there is a blockage or leak somewhere in the fuel line (See Checking fuel pipes) or the fuel pump is not working. I've replaced it with a new pump and it worked when first installed and the engine stated in January. The diaphragm and the two check valves will function while dry. Joined: Apr 12, … Fuel Pump Not Pumping. The standard mechanical fuel pump found in classic cars is very reliable. This truck has two fuel pumps. The fuel pump bolt torque specification is usually around 25 to 35 foot-pounds. The pump I took off had a spacer. and I even put in a brand new Fuel Pump. If fuel spurts out, there is a carburettor fault (See Checking and cleaning an SU carburettor).If no fuel, or only a dribble, emerges, either there is a blockage or leak somewhere in the fuel line (See Checking fuel pipes) or the fuel pump is 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. 1976 930( peru red usa) ,1980 euro sc, 1974 914. Carburetors and mechanical pumps aren't the most common fuel delivery systems these days, which may mean that you're unfamiliar with their quirks. High-performance automobiles usually have one fuel injector per cylinder, and the pump “injects” fuel into the combustion chamber – hence the name “fuel injector.”The fuel is dispersed from the injection pump to the combustion chamber via a fairly simple process. 1997 M3, , 2004 Duramax 3500 quad cab dually . Thread starter GPF; Start date Sep 24 , 2019; G. GPF Member. Another common place for a fuel leak to develop is in the rubber hose and metal tube that leads from the tank to the fuel pump. This should hold the rod in place while you install the pump. Of course, confirm that the engine immobilizer system (security system) is not activated thus preventing … Also, remove the inlet fuel pipe, seal the inlet with your finger and prime the pump manually with the lever. 6 years ago. The other end of the lever, which is linked loosely to a rubber diaphragm forming the floor of a chamber in the pump, goes down and pulls the diaphragm with it. At least it half way runs now from a gravity feed tank. If the push rod slides out, you can pack it with some heavy grease to hold it in place while you install the pump. I put a pump off of a engine that was running when pulled. This is one of the more common fuel pump problems found in classic cars that are between 30 and 60 years old. 0 0. 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. Learning how to diagnose these problems is essential for keeping your car in shape. The Problems of Mechanical Fuel Pumps. - posted in Mechanical & Hydraulics Forum: I cleaned out the carb on the 72 gt14. 2004 Turbo Pepperwagon, 1976 Chevrolet C 60 Rollback towtruck. 07-26-08 11:48 AM - Post# 1485917 New crate motor from Acworth Chevrolet. I put a pump off of a engine that was running when pulled. Firstly, look for signs of leaking fuel at the inlet and outlet pump unions; if fuel can leak out then air can get in and it's this air that significantly affects pumping capability. 2004 2500 HD Gas 1989 Yamaha xt 350. Car is not starting Inspection: $79.99 - $89.99: Get a Quote: Kevin Gainer. User Info. Take out the bolt and install a longer one while holding the push rod all the way in. Hi all. Once the connection is sealed, crank the engine over for 20 seconds. If the mechanical pump is working correctly, it will push four to six ounces of gas into the bottle. Empty gas tank. 1.Turn on the ignition switch, do not start the engine, can hear the fuel pump work for 1-2 seconds . Messages: 2,508 Likes Received: 748. 2006 x3 a … - posted in Mechanical & Hydraulics Forum: I cleaned out the carb on the 72 gt14. This is the pump that was on it. If you notice that this component is damaged, replace it with a reinforced rubber fuel hose. If your fuel pump is not pumping enough fuel to keep up with the engine, it may need to be replaced. 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. Priming one of these old-school systems is a fairly simple procedure, made all the more so since most were designed from the outset with the need for priming in mind. If the timing cover is made out of aluminum, for example, you should clean the sealing surface by hand without using abrasive materials. Other possible causes of your lack of fuel issue could be the fuel … Automotive Mechanic. They are entirely dependant on the fuel pump relay to provide them with power or remove their power. An electric in the tank and a mechanical on the engine. Hello dear visitor! When I pump the plunger it pumps as it should. On my 308, i am having some problems getting fuel to the carby. Replaced fuel pump new engine but still won't turn over what else could it be . It is hard to say with out knowing if the pump is an electric inside the tank or the old school mechanical on the side of the engine . Although this is the last resort before replacing the timing cover, it's often successful given proper curing time before restarting the engine. This can be completed in 12 seamless steps. On the front of the engine where the fuel pump is about 2 inches or so from the pump is a 3/8-16 bolt. Q: The vehicle is not getting any fuel to the engine. Once you made sure the in-tank pump is working, you’ll have to test the fuel pressure coming out of the high-pressure pump, a lot like you would do … On classic cars with mechanical style fuel pumps, however, the pressure is much lower—between four and six PSI. Carefully examine the old fuel hose; if it is frayed or cracked, replace it with new fuel line hose. I'm frustrated. 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. : DFW TEXAS Reg: 03-25-05 crate motor from Acworth Chevrolet fuel pipe, seal inlet. Or is this the original way, i bought a new pump and it right... 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Cant pull fuel if there are screws for dismantling to be replaced while!, there are two main components that make most fuel pumps found on classic cars are highly reliable months! Pump wo n't turn over what else could it be to tank since it would fire with! With letters getting any fuel to the timing case cover engine but still no fuel to the carby is trick! Gallon priming the carb on the line would fire up with starting but. And maybe i should try a different pump both the engine in your tank drawn! Inlet fuel pipe, seal the inlet with your finger and prime the pump Reg: 03-25-05 bottom of fuel... Follow when replacing the fuel pump work for 1-2 seconds wiring connector near the pump up. ) for my '69 440 Coronet R/T 89.99: get a Quote: Kevin.. It fired right up ( peru red usa ),1980 euro sc, 1974..