Fuel pressure
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Freshman User
Joined: Dec 2017
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Fuel pressure
I checked my fuel pressure on my 1999 f250 5.4 triton. Turning the key from off to on 1st time was 10lpsi, second time was 30psi, third was 35 psi. Started truck 35 psi at idle are these numbers ok?
Thanks
Thanks
Fleet Mechanic
Joined: Feb 2011
Posts: 1,812
Likes: 88
From: Thousand Oaks, CA
Since you are seeing only 10 psi something is starting to go.
Before blaming the fuel pump the fuel pump power relay should be checked.
I think on your year it can easily be swapped with another relay (or a known good relay) and recheck the pressures.
How many miles?
Has the fuel filter ever been changed?
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