Question about 1997 GMC Yukon

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My car is not starting even though the battery is good

There is no fuel pressure at the caburator. we have changed the fuel filter and fuel pump it is still not starting up.

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First here some kuik test;get an carburetor choke cleaner spray and spray it to carb and see if the engine start. if the engine start then stop ,your pump in the tank is not working. now go to the fuses box and ck the fuel pump fuses and all the fuses on the pannel

Posted on Dec 22, 2008

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1992 F350-7.3 4wheel drive is hard to start after changing fuel filter and fuel pump. Why is it hard to start?


indicates fuel leak back and fuel pressure drop
check filter installation for seal not sitting properly, loose fuel line fitting , pump installed correctly (flow wise ), filter installed correctly (flow wise)
air getting in to fuel lines
the thing you are looking for is indicated by the initial hard start but when started runs ok ( good fuel to the engine eventually) and then by the fact that if the engine is allowed to sit for a long period the problem returns meaning that the fuel pressure is not being held
could even be a problem fuel pressure regulator allowing the fuel to bypass ( no pressure =hard starting) then gets enough pressure to run ok but allows that pressure to drain off over time

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Good fuel pressure from the pump is fine, at the pump. But if it can't flow constantly it WILL shut down. Have you though about changing the fuel filter? even a dirty fuel filter will allow enough fuel to the engine to allow it to run for a few seconds or so. When that little bit is gone, can't get enough to still run.

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have pressure test done on the fuel manifold and look for a faulty pressure regulator that is allowing the fuel to drain back and allowing air into the manifold. It will also check for pump and filter faults.

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May be having fuel pressure problems. I would change the fuel filter if you haven't in awhile. A plugged filter will cause the fuelpump to overwork, not build proper pressure & wear out prematurely.

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1 Answer

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have you check fuel filter it my cluged.
check fuel pressure with gauge and compare result with service manual. if pressure is to low you may need new fuel pump.

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1 Answer

I HAVE A 1974 TOYOTA COROLLA. THE CAR STARTS


Have your battery checked - could have dead cells. Even though you have changed fuel pump and filter is fuel getting through could be a blocked line.

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1992 toyota celica gt 2.2 starts runs rough then dies


Sounds to me like the fuel pump is worn out. They DO wear out. And even though they seem to be working, the brushes in the electric fuel pump may not be contacting all the commutator, thus making the pump weak. It may start the motor but can't maintain normal running pressure (27-35psi). Have you run the car out of gas shortly before this problem surfaced? If you have then it's your fuel pump. It was damaged when the tank ran dry. Even though the pump may seem to be working, it's still badly damaged and needs to be replaced.
Just as Matmenzies has stated, get a fuel pressure gauge and test the pressure. I'd start with a complete check of all your vacuum lines. Check for cracks on the vacuum hose that connects to fuel pressure regulator on the fuel rail. Also, if you can, get a hand operated vacuum pump to check the regulator. If you can place a vacuum on the regulator and it holds, I'd say move on the fuel pump and check it.
BTW, if the fuel filter has been changed, you may want to check to see if it was installed backwards! Some fuel filters are valved and will cause symptoms like this. However, this is an immediately noticeable mistake and you haven't provided enough info for me to say more. I'd pull it and check that it has any flow at all. You could have sucked in a big dirt ball and blown it right into the new filter, effectively stopping fuel flow. Then I'd blow out the fuel lines, just to be sure.
Start with these 2 things and post what you find. We'll go from there.

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Have you checked the fuel filter? Have you changed it EVER?

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Locate the Fuel Filter and Take it loose. Try to Start the Truck, If the Pump is Good, Fuel will come out of the Fuel line going to the Filter. Please Rate My Response! Thanks!

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