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4.2 fuel pressure

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Old 01-25-2004, 06:06 PM
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4.2 fuel pressure

i did a fuel pressure test on my 97 f150 4.2 everything is within specs except when i remove the vacume line from the presure regulator the presure didnt increase like the book said it should does this tell me my regulator is bad?
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Old 01-25-2004, 09:41 PM
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Did the line have vacuum on it?
What was the pressure that you were getting?
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Old 01-26-2004, 06:56 AM
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the line had vacum i was getting between 30 and 40 psi
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Old 01-26-2004, 08:12 AM
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It should be about 32 psi with vacuum and 40 or so without.
If it sin't changing and you have a contant 40psi, then I would suspect the regulator. Did any gas come out of the vacuum port on the regulator?
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Old 01-26-2004, 08:39 AM
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no gas came out that i noticed thank you for the response
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Old 01-29-2004, 01:01 PM
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4.2 fuel presure

i changed my pressure regulator it fixed the stumble and the hard starts for 1 day now its doint it again sometimes it surges when i take off it acts like it is running out of fuel but it takes off about a secong later
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Old 01-29-2004, 06:00 PM
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Clean the MAF. Also, check the TPS sensor, it could have a bad spot in it.
Jimmy
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Old 01-29-2004, 10:32 PM
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tps is a week old cleaned the maf 2 weeks ago
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150, 2002, 42, 97, 99, f150, ford, fuel, location, motor, port, pressure, regulator, test, v6

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