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Old 07-14-2019, 06:51 PM
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Originally Posted by andrewwynn View Post
Pressure should be 50 psi. Definitely start with fuel pressure
Yes sir 50 PSI running, no less than 45 PSI after 15 minutes but at least 35 PSI after sitting overnight or after a few days.

I'm not sure on the 4.8 fuel pump but when the key is turned to position 2 the pump should prime. Maybe the OP can turn the key to position 2 several times before cranking to prime the pump/system to see if it is better. This would give an indication that the fuel pressure is low.
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