wont start on 1997 Chevrolet Tahoe

why do i have to spray my truck with starter fluid to get it to start.new fuel pump and it stays running after that.only if i let it sit for a couple of hours will i have to spray it again though

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1 answer
Checking fuel pressure with the correct type of fuel pressure gauge would be the first step in determining what is causing the no start condition on your 1997 Chevrolet Tahoe. The fuel injection system used in the 5.7L (I am assuming) engine needs the correct "surge" of fuel pressure when cranking the engine. Fuel pressure should be 60-66 for the Central SFI and 56-62 for the standard SFI engine, fuel pressure should hold steady after the fuel pump turns off. Fuel pressure should also spike to those values with the engine running and the throttle "snapped" open. The VIN code (8th digit) for the Central SFI engine is "R", Please make sure which injection system you have, as you can see it make a difference in the fuel pressure specs. If any of the above tests fails the fuel pump and circuit should be thoroughly inspected.