Fuel Pressure

hoffmandj

Registered User
I did a test on my Fuel Rail and I found that with the key on engine off, I had only 20lbs. Then with the key on engine running it was resting at 30lbs. I know this would cause a miss. My question is, Why would the car miss at idle and high rpms but run fin between 1,000 and 3,500 rpms.
 
If you turn the igntion key to ON and do not start the engine the fuel pump runs about 3 sec. then shuts off. If you are not measuring fuel pressure with the pump on you may not be getting an accurate indication. At idle you should have about 30-40 PSI dependant on the vac. you have at idle. If I knew how much vac. you have I could give a more accurate answer.
 
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