Leak Down????
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Freshman User
Joined: Sep 2000
Posts: 33
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Leak Down????
Just changed my fuel filter & now it takes longer to start the engine!! Went back to the parts store & got another filter & swapped it out & still it takes twice as long to start, like it was leaking fuel pressure, but there are no fumes or liquid to be found. The filter is a standard replacement & is installed in the right direction too. When I released the fuel pressure from the fuel rail & the the filter came out, could that cause the fuel pump and/or fuel pressure regulator to malfunction? Truck runs great once it warms up. Any Ideas???
Jim Shad
1992 Ford Explorer XLT
Ford Forever!!
Jim Shad
1992 Ford Explorer XLT
Ford Forever!!
Postmaster
Joined: Jul 1999
Posts: 3,172
Likes: 4
Leak Down????
You need to check the fuel pressure . Once you turn the key to on , the fuel pressure should build to at least 30 to 40 Psi & stay there for several mins . I think a 2 to 3 lbs / min leakdown is acceptable . Once you start the engine the fuel pressure should reduce somewhat but still be in the 30 to 40 Lbs Psi range . After its running , removing the vacuum line from the pressure regulator should max out the pressure to 40 Psi . Changing the fuel filter shouldnt have any adverse affects ...Any air that entered the line will quickly be expelled as you crank the engine to start it . The pressure should vary with engine rpms as well .
Thread Starter
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Freshman User
Joined: Sep 2000
Posts: 33
Likes: 0
Leak Down????
Ok, if I check the pressure its low, it would be the fuel pump malfunctioning right? If I disconnect the vacuum line off the fuel pressure regulator & it maxes out to 40 psi, that means it's working properly, right? After it starts, it will restart as it always did right away, but after sitting 15-20 minutes it will need for you to turn the key 2-3 times, but not start just enough for the fuel pump to cycle & build pressure then complete the start on the third try. It then starts right up. Any thing else??
Jim Shad
1992 Ford Explorer XLT
Ford Forever!!
Jim Shad
1992 Ford Explorer XLT
Ford Forever!!
