Question about 1995 Buick LeSabre

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No current to the fuel pump at the fuel tank

Engine cranks but won't start no fuel pressure pump has no power going to it, running fine till I parked it then when tried to start to leave would crank but no start. I checked the fuel pump and found to power supply to the pump at the tank supply.

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Have somebody cycle the key on and off and see if you have power not cranking the engine just from the off to on or run position. If no power, check your fuse for the f/p and the coresponding relay. bet way to check fuses is with a test light. Most times a power window, a/c or heater relay will be the same and you can switch it out to see if it solves the problem. mike

Posted on Jan 04, 2009

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1998 malibu can hear fuel pump wen switch is on but wont start as long as we put fuel in top of motor it will run till itruns out could it be relay on fuel pump changed filter


the fuel pump will run for 2 secondes with key on to prime system. then when you crank engine it should run all the time. you check fuse and if current go to fuel pump at tank connector. if there is current then the fuel pump must be defect.

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My 94 Thunderbird won't start until like the 4th crank, then it runs like a champ. It acts like it isn't getting any fuel. Please help!


You may be right on your hunch.
The fuel pump gets power from the pump relay for 3 seconds when you turn the key on, then no power until the engine starts. If the fuel pressure is low it could take several trys to get the pressure up to normal and the engine start.
A mechanic would check the pump relay and the fuel pressure with a gauge before and after cranking the engine.

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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.

Dec 12, 2012 | Cars & Trucks

1 Answer

HARD TO START


To clarify, the engine cranks and starts. If it cranks but won't start until 4 or 5 tries, I would check the fuel pressure before and after the first attempt. The check valve in the pump may be faulty and allowing the fuel to flow back to the tank when it is not running. The pump only gets power for the first 3 seconds during crank time until the engine starts.

Aug 27, 2012 | 1999 Chevrolet Express

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Chevy Malibu 2003 cranks but won't start! I know


You might have a defective fuel tank pressure sensor!

May 05, 2012 | 2003 Chevrolet Malibu

1 Answer

My car was running fine yesterday and this morning it didn't start. got a new battery, replaced the oil and checked the fuses. everything is fine but car still won't start. suggestions, please


Check for spark and fuel. When you turn the key on you should hear the fuel pump in the tank for a few seconds till the pressure builds up. When you crank the engine there should be spark at the plugs.

Jun 05, 2011 | 2003 Toyota Highlander

1 Answer

Hi. I have a 94 F250, 4.9 automatic. When parked over night, fuel seems to drain back to tank and it takes alot of cranking to get it running again. It stumbles and runs rough till it's pressurized...


There is a check valve in the tank, part of the sending unit. you can't buy it by itself. Instead of cranking on the starter to get it started. just turn the key on and off 3 or 4 times. it energizes the fuel pump everytime you do it. this should get your vehicle started.

Nov 16, 2010 | 1994 Ford F250 Supercab

1 Answer

Hard to start


Guessing that you have the 4.3 vortec and that you just parked it and it has gas in the tank and the battery is up high enough to crank the engine fast. The days before this happened the Blazer ranjust fine. The fuel pump either stopped or is'nt putting out enough pressure. But check easy things first, Is there gas in the tank? does the engine have spark? Pull a plug wire off and lay it on a medal part of the engine and crank it and it should spark loud enough that you can see it and hear it. Good move on, bad, Look at the dash meter. Is the security light staying on? or does it act like it always does? Or it's possible that your car doesn't have one. Was the Blazer running without the check engine light on last time it was running? If it was a scanner needs to beconnected and check for engine control codes. Follow up on codes and then clear them and try again. Still nor running? The fuel pressure too low is tricky to verify, If it has spark it's likly to run, Ad a litle gas to the air inlet and start it it's possible it'll start and then keep running, cause it may have enough pressure to run but not start. (proof the fuel pump is bad) It may flash off (start up but quit soon) just running on the fuel you added. Have someone help you and listen for the fuel pump, Take the gas cap off and put in a funnel, Shake the truck and listen for the fuel slossing around. Have someone try to start and let off the key in run and you should be able to hear the pump at the funnell, It hums or buzzes, If it's very loud it's possibly bad too. Very good pumps with lots of gas in the tank are hard to hear, The pump stops shortly after the key isn't cranking and the engine is'nt running. If it's runnung and it still doesn't start but will flash start withthe added fuel, get a fuel pressur tester and connect it to the fuel line port naer the firewall behind the intake manifold. 50 psi or higher and it'll start if it's going to less than 45 it might run. lower than that it won't.

Jun 12, 2010 | 1997 Chevrolet Blazer

1 Answer

Crank engine many times


But it starts good cold? The injectors are leaking ( dirty ) the fuel pressure can be too high or low the fuel pressure regulater can be leaking or bad, the fuel filter can be stopped up' the check valve in the fuel pump can be bad letting all the fuel back into the tank and it has to reprime every time the oil pressure switch can be bad and the pump doesnt start till the override kicks in ( then the thing will take the exact same number of cranks to start) Try to start it by just bumping the starter three times then crank it if it starts right up then you know where to look.

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2 Answers

Runs fine till warms up then losses power and dies


Does the fuel line still have 55 PSI when engine warmed up? Any other codes show up?

Aug 22, 2009 | 1998 Chevrolet Blazer

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