What is the model and engine size? If you have the spider fuel system, start up fuel pressure is very important, usually around 60--66 psi. Once you get it started, it will run with less pressure.
SOURCE: fuel problem in 97 chevy truck 1500
your fuel pressure regulator could be bad also check fuel pressure with a guage it should be about 55 to 65 pounds
SOURCE: How do you know if the fuel injector is bad or the
Hello there:
To be totally truthfull with you i would first have the fuel filter changed to ensure that the fuel pump can do its job properly than if you want to know if the injectors are working the vehical needs to be running then go to each injector and pull the wire from the injector if the engine starts to shake or make a totaqlly different sound than you know this injector is working HOWEVER if there is no change in the way the engine runs than you have a bad injector or the wiring going to that injector is faulty ok>
I dont think that you pump is bad they rarly will not run at all if they are bad they either work or do not work but you can always take the outlet side hose off and get a large container and to catch the fuel in than have sombody turn the key to the on position and see if you are getting good flow but if it looks weak and barly coming out than yes replace the pump ok?
Hope this is very helpful for you.
Best regards mike
SOURCE: 1998 chevy tahoe 4x4 wont
fuel pump or fuel pressure regulator. When you turn the key do you hear fuel pump run? If not odds are the pump is bad.
SOURCE: 97 jimmy runs when you
If the 8th letter of the VIN # is W which i bet it is than your fuel pressure is to low.
This engine uses a CPI unit to deliver fuel to the cylinders. The CPI unit consists of a central injector that feeds fuel to the poppet valve that are right above the intake valves. The poppet valves require high fuel pressure in order to open and deliver fuel to the cylinders at start up.
The reason why it starts and runs if you add a little gas through the throttle body is that once the vehicle is running the intake is under vacuum. The poppets can open with less fuel pressure in a vacuum. This is a real common scenario with these style injection systems.
A new good quality fuel pump (a/c delco or delphi are good pumps) and your fuel pressure should be back into spec of 58 psi or more and the vehicle should fire right up. Make sure you replace the fuel filter when you replace the pump.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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