Diagnosing a Fuel Pump Relay Failure: 95 Chevy Tahoe 5.7L TBI

mrrsm

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Oct 22, 2015
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Part I

This involves diagnosing a 1995 Chevrolet Tahoe with a 5.7L with TBI having a “Cranks-→ But No Start” situation that focuses on diagnosing electrical problems covering the failure of the Fuel Pump Relay. The OP’s procedures and explanations are suitable for most Mechanics with even a basic set of repair skills and that require no exotic tools to accomplish:


But also… in an unusual secondary diagnostic observation, the OP discovers THIS interesting matter:

Part II

This one involves his focus on the apparent back-up ability of the Oil Pressure Sensor on this ‘95 Tahoe to bypass a Bad Fuel Pressure Relay and keep the Fuel Pump Working ...without having the FPR failure leaving the driver stranded on the side of the road. In this case, the OP’s Component Testing and Evaluation Procedures are very clever and easily achieved by most capable Mechanics:



 

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