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Re: Help before I go crazy. 99 suburban 5.7 vortec wont start.
The only "low cost" way to detect where the fuel system is loosing pressure is to put a shut off valve in the fuel supply line to the engine. After shutting the engine down, immediately close the valve to eliminate the fuel pump check valve as the culprit.
If the pressure goes down even after closing the valve, you only have 2 choices. Both of which are under the upper plenum on a L31.
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