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Re: I need to know the fuel pump normal pressure for a...
You can pull the line off of the fuel filter and stick it into a bottle and have some one turn the key on and see if gas is coming out then if it is try it on the one on the block and see if fuel is reaching there
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What is the fuel pressure? these trucks need a certain amount of pressure to start, if low just 3psi it will not start, if you are sure the pump is good then you may bad spider injector. check fuel pressure first and also try spraying starting fluid into throttle body and see if truck starts. the pump needs 60 -66 psi to start the truck.
The pump is powered by the relay. The relay is grounded by the computer. It gets a ground signal for the first 3 seconds, then only if the computer sees oil pressure or RPM to know the engine is running. You should be able to ground the relay and run the pump for several minutes. After 30 seconds you should be at max pressure. Normal pressure is 15psi for a truck that has throttle body injectors such as a mid 80s model, and 65psi for trucks that have port fuel injection like yours. You may have the wrong pump.
The fuel system pressure for your Jimmy is 55-61 PSI (Pounds per Square Inch)
Vent the fuel tank vapors by loosening the fuel cap. Position the ignition switch and the A/C system in theoff position. Install a fuel pressure gauge to the vehicles fuel pressure valve. Confirm that no leaks are present, and with the key ON, engine OFF verify the PSI reading on the gauge.
this is the highest failure rate of any part. I've been in auto parts for nearly 10 years and one thing is certain, you need to replace your fuel pump. Do not get a Carter brand pump. ONLY get a Delphi or Genuine GM pump. The less expensive pumps last about 1000 miles.
When you hook the pressure test guage to shrader valve on fuel rail what it reads is what the pressure is from pump, around 60 p.s.i. all you need to do is hook up the guage and turn on key, you do not have to turn engine over, and if pump is good it will shoot up to 58 or 60 right now.
under the hood on the top of the engine u will find the metal fuel supply rail, on that rail there is a metal valve it looks just like a tire valve, u check the fuel there with a test guage that screws on there at that port, the test guage is cheap and avail at any good parts store.