Question about 1988 Mercury Grand Marquis

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Is the fuel pump in the tank supposed to run more than 2 seconds and stop. just put new fuel pump in and not getting fuel to front of car

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It should stop when the pressure reaches maximum. Maybe you have a blockage? Replace filter?

Posted on Sep 06, 2010

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Posted on Jan 02, 2017

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My 1993 geo prizm car cranks very well but if i try to start it, it will not start, it seems that there is no gas getting to the engine


A couple of ways to check if you don't have access to a fuel pressure gauge. You should hear a brief hum or buzz from the gas tank area just by turning the key to on, not start. The fuel pump is supposed to turn on for 2 seconds to put pressure in the fuel line and at the injectors. If you hear nothing, the fuel pump may have failed, but check the fuel pump fuse to know it is not blown . To check further, spray a shot of starting fluid into the air intake housing-take off the big air boot from the air filter housing to the engine, and spray inside there into the engine. Now try to start the car. If the engine coughs to life and tries to run for a few seconds, then you know it wasn't getting gas, and that usually is a bad fuel pump or a totally clogged fuel filter. To check the filter, take it off and blow into the outlet side first and see if what comes out looks clean. Then blow from the inlet side and make sure the filter passes air, that it isn't blocked. If the filter was clean, it must be the pump. It is supposed to turn on briefly with key turned to on, and then it runs constantly when the engine is cranking or running. So it has had a good long life since 1993. The definitive test of a bad pump would be to find live power at the fuel pump wire at the gas tank connector while the engine was cranking over. If power there, but no pump working, definitely time for a new pump.

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Do you have 2 gas tanks?

Jun 21, 2017 | Ford F-150 Cars & Trucks

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Engine cranks, runs for 1 or 2 seconds and then stops.


Two items to check. The crankshaft sensor will reduce fuel pump pressure if it miscounts the RPM. The plastic strainer in the fuel tank can break apart and clog the pump intake in the tank. When the engine quits, the fuel pump is stopped and the loose particles are returned to the tank bottom.

In either case, try checking the fuel pressure at the test tap on the fuelrail.

Feb 03, 2014 | Ford Crown Victoria Cars & Trucks

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1990 s-10 4 cylinder 2.5, 5 speed, throttle body injection, 120,000 miles won't start without stating fluid. Runs fine after started, I've changed fuel pump, filter, plugs. I appreciate any help.


My first question would be is the injector spraying when you crank it ?
The way its supposed to work, the fuel line to the tank should have about 10psi of pressure before you crank the engine. When you turn the key on the pump gets power for 3 seconds to boost the pressure. The pump stops working until the engine has oil pressure which takes a few seconds.
If the base fuel pressure leaks back to the tank, or the pump relay is not powering the pump, you won't have any fuel pressure or spray until you get oil pressure.

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Motor turns over won't start. Cleaned terminals, put in new battery, still won't start. Removed gas cap to vent air on hot day, still won't start. Lights all come on, all electrics appear to...


Your problem may be one of the following:
First check or just replace the fuel filter. Usually located under the car in front of the rear axle, drivers side.
Next, the fuel pump may be worn out. Usually they get loud or stop working (running).
Next, check the fuel pressure regulator. Usually located on the front fuel rail, drivers side.
Is the vacuum line attached? Not leaking or rotted?
Also, do you smell a strong fuel odor when it won't start? May be one or more stuck-open injectors, or the coil pack is bad.
Checking these in the order listed will more than likely fix your problem.
The clicking noise indicates the battery can no longer run the starter, which also means the fuel pump won't run either.

It could be a fuel issue. How old is the fuel filter? Can you hear the pump run for a few seconds when you turn the key on? Try turning the key to ON without trying to start engine three times waiting for the pump to stop running each time. Then try to start the engine. If it starts, Its a form of Vapor lock caused by the extreme heat we have had lately, and a weak fuel pump.

If none of this works, try a new fuel filter first. From there have someone check the fuel pressure regulator and then the pump. If you are in need of a new pump, take my word for it and spend the money to get one from a Dealer, and not from your favorite parts store. Most parts store parts are made in China and they are JUNK.

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1 Answer

1996 olds 88 3.8 engine starts up runs about 15 minutes then shut down.Wait a while and will do same cycle over. I replace fuel pump, filter tank clean. No codes, engine runs find until it stops getting...


There is a fuel pump prime cycle (2 or 3 seconds)when you turn the key to on and once you start the engine the fuel pump power comes though the oil pressure switch.No oil pressure,no power to the pump.maybe your oil pressure switch has become weak?I would use a scan tool and command the fuel pump on when it does shut off,just to make sure the pump can run,as it could be a bad pump too.Also when it does quit,if you turn the key off for 10 seconds, you should get a prime cycle by turning the key to on.Have someone listen at the gas tank for a fuel pump noise,which will be only 2 or 3 seconds,but will do as a pump running check.Next would be to check for power at the back at or near the fuel pump,power and no pump.replace pump.No power to pump,follow power back to the front through oil pressure switch and fuel pump relay etc.You can always add your own power to the pump from a power source the switches off with the key if needed bypassing the existing wiring and oil pressure switch.

Mar 15, 2017 | 1996 Oldsmobile 88

1 Answer

No check engine light on until it stalls out. While driving around town and approaching stop sign/light, sometimes car will stall out. I also notice that my fuel gauge dips down about 1/4 tank and then...


You didn't say how much fuel is in the tank when this happens. Some of these old GM cars will starve for fuel if the tank is near empty and you are braking or stopping with the car facing downhill. It could be rust or scale in the fuel tank clogging the screen around the fuel pump inlet. Sometimes, putting cleaner in the tank of an older car will only cause more debris to loosen up from the inside of the tank and make the problem worse. If the problem gets worse, I would guess tht a new fuel pump/sloat assembly is in order. You may have to have the tank removed and cleaned or replacedd with a new one to prevent the problem from reocurring.

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1997 Dodge Intrepid has set up for several months while in hospital. Will not fire. Put small gas amount in air intake and it fires and runs for 10-15 seconds. Gas probably not getting to injectors. Pump...


Several months could be a tank of bad gas. When turning the ignition to on position the pump runs for 3 to 5 seconds to pressurize the system, next find the valve on fuel rail and press it, Shield with a rag while doing this. You should get fuel. Check the way it smells, bad gas has an awful smell that can make you hurl! Attach a fuel pressure tester, it should be around 50lbs. If it's bad empty the tank by pressing the needle and relieving the pressure. Next disconnect fuel line before the filter get a container to catch the gas. IN the engine conpartment disconnect the fuel pump relay and put a jumper wire to run the pump until tank is drained. Instal new filter and pump if needed and add a can of "Seafoam" to the tank with fresh gas. Run pump until there's fuel at the fuel rail then put relay back in. now we should have ignition and constant running. Hope this helped.

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My car was low on gas, started but then died. We put gas in, but the car won't start now. What is wrong?


sounds like your fuel pump has retired on you,running you car low on gas is hard on pump,they are cooled by the gas an are lubercated by the gas, I hope this helps you

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I'd bet the fuel pump is bad, You say you are getting fuel, but are you getting good pressure?

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