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Old 03-25-2011, 10:38 AM   #1
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Default check fuel pressure?

how do i check fuel pressure with my 4.2 v6 f150..
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Old 03-25-2011, 12:25 PM   #2
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Connect a fuel pressure guage to the schraeder valve on the fuel rail. Pressure should be about 28 psi at idle and if you bump the throttle - it should rise and then resettle to 28 once it falls back to idle.
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Old 03-25-2011, 02:32 PM   #3
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thanks where is the schraeder valve under the intake?
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Old 03-26-2011, 02:47 PM   #4
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It shouldn't be. I can't remember which side on the V6 right now (V8 it's on the driver's side) but the fuel rail should be right on top and one side will have a cap sticking up out of it. Under the cap is the valve.
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Old 03-26-2011, 03:58 PM   #5
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thanks found it..checking it tomorrow..can you have a weak fuel pump? i been driving like this for month now and has not gone out..issue that i have is bad start up sometime and can not floor it over 3,000 rpms with out it bucking and choking..i replace mass,plugs and wires,also fuel fliter and it was clean..
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Old 03-26-2011, 06:44 PM   #6
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The fuel pump can be weak. It's usually not a total failure when it goes. Make sure you check for vacuum leaks too while you're there, they can cause goofy symptoms too.
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Old 03-28-2011, 10:35 AM   #7
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deff no vacumm around the intake spent a hour spraying her down with carb cleaner nothing..taking it to a dyno shop friday and they can have fun finding the problem
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