Question about Cars & Trucks
Have you checked the fuel pump relay to see if it is sending power to the pump ?
Posted on Dec 11, 2012
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Posted on Jan 02, 2017
SOURCE: 2004 cavalier fuel problem?
Please call me its easier to explain on the phone, in the mean time try something easy hit the fuel pump on thebottom with a brick or rock then have someone listen to the fill neck of the tank for the two second "buzz" as soon as you turn on the ignition, has this vehicle been run way way low on fuel many times or the fuel filter neglected to been changed at the 15,000 miles interval?
call me or I can call you 253-691-6206
Posted on Aug 24, 2008
First, you need to check the MAF sensor for contamination.
Second, check fuel pressure, if you dont have a gauge, autozone and Advance have them on their tool loaner program.
Should see 35-40 psi with key on engine off, cycle key a few times, if it takes a while to build up, replace filter and retest.
Third, possible convertor blockage, easiest check is to remove the 02 sensor and try to start with the hole open, if it runs, then that is it, specs allow for 2-3 lbs of back pressure max. That means if you can hear pressure escaping, it is a problem area.
Posted on Sep 01, 2008
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.
Posted on Jul 09, 2009
OK, first, let's clarify one point. Your 1986 Chevrolet Nova does not have a carburator, it is equipped with Throttle-body Fuel Injection.
You should be able to look into the throttle body and see fuel spraying from the fuel ijector while you are cranking the engine over. If not, then there is a whole list of things that could be causing the fuel to not spray. Here are some of the possibilities:
Low fuel pressure (for several possible reasons)
no B+ feed to injector (for several possible reasons)
bad crank sensor
broken injector wires
If it runs with fuel poured down the throttle-body, it is definitely a fuel-delivery/fuel injection problem.
Posted on Oct 17, 2009
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