Question about Cars & Trucks
It could be either one, if the fuel pressure is too low.
Try this, as a rough test of fuel pressure. On the engine on the fuel rail is a test port to connect a fuel pressure gauge. It looks like a tire valve, may have a cap on it that unscrews. Follow your fuel lines to the top of the engine-they will connect to the fuel rail -where the injectors are. If you find the test port, use a small screwdriver or little punch type of thing: be careful of gas spraying out, don't hold your head over the test port: you want to press in the center little valve and see if gas spurts up out of the valve, with the ignition key in on, not start. If gas spurts up, you know the pump is working well enough to get gas up to the engine. The fuel pressure on multi port injection is quite high, about 50 psi. You would need to check what Isuzu calls for. It really would be best to rent a fuel pressure tester, if possible, and connect it at that test port, turn the key to on, and see what pressure you have. If the pressure is as called for, then you know the pump and filter is okay, and can look elsewhere for the problem.
"...tries to start, but turns off..." you mean it does fire and try to run for a second? That does sound like it may be a fuel problem.
Posted on Dec 31, 2013
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Posted on Jan 02, 2017
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