C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Fuel Pressure drop

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Old Jul 7, 2006 | 03:25 PM
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Default Fuel Pressure drop

Question: What is the accepted fuel pressure drop on a C4 in terms of time (not running.. turn key on to energize pump, and then shut off)??



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Old Jul 7, 2006 | 03:39 PM
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When I did mine (87) the pressure reached 40-41#, after sitting 10-15 minutes went down to around 37-38#, half hour later it was still there, I said good enough. I'd be concerned if it dropped rapidly, and how far.
If it dropped to 0 in a half hour or less I would be looking for the problem, if it only dropped 5-10 # in that time..IMO, ok.
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Old Jul 7, 2006 | 03:42 PM
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thanks for the input... mine has dropped from 43 to 30 in about 20 minutes...
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Old Jul 8, 2006 | 06:56 AM
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https://www.corvetteforum.com/techti...=278&TopicID=2
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Old Jul 8, 2006 | 07:54 AM
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http://members.shaw.ca/corvette86/Fu...mDiagnosis.pdf
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Old Jul 8, 2006 | 05:29 PM
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Thanks for the input...
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