Question about 1995 GMC Yukon

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Engine will turn over but not start

There is spark but no smell of fuel. Is the fuel pump electric and could it be working intermittently?

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  • Anonymous Feb 12, 2009

    I am hesitant to spend money on a new fuel pump when there are a few tests I may be able to do .

    What range of Amperage does the fuel pump draw ?

    Is it safe to bypass the relay to check the fuel system pressure ?

    Is there a port for testing the pressure ?

    What would the fuel distribution manifold pressure be ?

    These questions I know can be answered by a service manual but that costs even more .

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  • 81 Answers

Yes the pump is electric and its located in the fuel tank. If the pump is getting power and ground, and not coming on it needs to be changed. Use only an OEM pump in this vehicle. Don't use an aftermarket pump.

Posted on Dec 28, 2008

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1 Answer

Could this be something other than the fuel pump?


If you smell gasoline when tying to start the engine then it's not your fuel pump. It's more than likely an electrical component stopping it from sending spark to the plugs, rent or buy a code reader, pug it into your car and get t codes, these codes will give you a real good idea of were to start looking for the problem.

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does the engine turn over but not fire? it may not be fuel to check remove one of the spark plugs and while you turn engine over get someone to look out for signs of fuel emmitting from open cylinder if there is a smell/puff of fuel check that you've got a sperk at plugs as a starting point if not get the OBD read

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Cranks won't start


smelling gas like you are is a bad thing, engine must turn over to fire injector. sounds like flooding ( possible ECM/power computer bad ). Before condemning the computer pull all spark plugs, disable ignition coils, then try cranking to see if engine will turn over. Be carful if hydro locked gas will be pushed out the spark plug hole/s

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is this diesel or petrol.if diesel then look to your fuel pump.under it is a plug .remove this and drain what will be water on the bottom of it.only a small amount then refit.now pump the fuel up to it is very hard .then get someone to turn the engine over .as you keep pumping should then start.that is done due to air in the system. if petrol you need a spark plug tester.check the coil has a spark .then check the leads at the spark plugs are getting a spark .then check the plugs for a spark .smell them .do you smell fuel on them .if so change the plugs.

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My 1997 GMC Sierra 5.0 Litter wont start and i changed the fuel pump regulator, what might be the problem?


engines need 3 things to start (petrol engine)
fuel, air and a spark,
as you have been working on your fuel system it is best to suspect this system first,
on engine turn over see if you can smell fuel at the exhaust.
if you smell fuel the fuel regulation mybe too high and the engine is flooding.
if you do not smell fuel, remove fuel line from engine and ensure fuel is getting to the engine,
(be careful not to let fuel spill this generates a fire risk)..
once fuel is getting to the engine, check your ignition system to ensure you have a good spark to ignite the fuel.
finally check your air filter is not blocked and that you have air getting to the engine.

I hope this was helpful.

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1 Answer

My volvo 740 non turbo car has resently failed to start i need some ideas on what to do, When i try to start the car it will crank but will not turn over and start, this is my first car so i have no idea...


the engine is either not getting fuel, or is not getting spark. with the ignition key in the "run" position, listen under the rear of the car (near the fuel tank) for the sound of the fuel pump. or, after cranking on the starter for a while, remove a spark plug and smell it. smells like gas? if so, the problem lies in the electrical area. if not, fuel is not getting to the engine.

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1. use scanner to find out if there's trouble code.

2.. it's not clear if the starter (motor) turns as you try to start the engine, if not, check starter motor including intermittent (maybe) problem with the ignition switch.

3.if starter motor turns everytime you try to start: check the electrical ignition system: coils & spark plugs

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1 Answer

Engine cranks but wont start


This may be a result of no fuel or no spark. To test, remove a spark plug after turning the engine over for a few turns and smell it. If it smells like gas, it's a spark problem, if not you should check your fuel lines for leaks or your fuel pump. A quick way to test the fuel pump is to put the key in the ignition, turn it to "on" but don't try to start the car and listen for the pump to "prime" the system. It will sound like a low humm.

To check for spark, remove a plug and hold it against the engine block while someone tries to start the car (only turn the engine over once or twice while doing this!). If you are getting spark, you should see it. If you aren't, check the firing order, the distributor cap/coil packs, wires, and the plugs themselves.

I hope that helps and good luck!

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