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P1800 ES 1800 1973

posted by  planetman on  Sun Aug 18 16:02 CST 2019
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Oct 24 09:29 CST 2014
[RELATED]

It is normal for the rest pressure jump down to about 20 psi and then slowly drop to 0.

This is normally due to the fuel pressure regulator. But it can also indicate a leaking injector and that includes your unseen cold start injector or a bad fuel pump check valve.

Try pinching both fuel pressure hoses at the regulator right AFTER you cycle the fuel pump and then monitor your fuel pressure gauge. If the pressure continues to drop then you have leaking injector or hose.
--
Eric
Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
Torrance, CA 90502
hiperformanceautoservice.com or oldvolvosonly.com






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