4.2 fuel pressure

Reply Subscribe

Thread Tools

Search this Thread

Jan 25, 2004 | 05:06 PM

iahte my ford4.2

Thread Starter

New User

Joined: Jan 2004

Posts: 15

Likes: 0

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?

Jan 25, 2004 | 08:41 PM

LxMan1

Moderator

Joined: Dec 2001

Posts: 22,436

Likes: 17

From: Louisville,Ky.

Did the line have vacuum on it?
What was the pressure that you were getting?

Jan 26, 2004 | 05:56 AM

iahte my ford4.2

Thread Starter

New User

Joined: Jan 2004

Posts: 15

Likes: 0

the line had vacum i was getting between 30 and 40 psi

Jan 26, 2004 | 07:12 AM

LxMan1

Moderator

Joined: Dec 2001

Posts: 22,436

Likes: 17

From: Louisville,Ky.

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?

Jan 26, 2004 | 07:39 AM

iahte my ford4.2

Thread Starter

New User

Joined: Jan 2004

Posts: 15

Likes: 0

no gas came out that i noticed thank you for the response

Jan 29, 2004 | 12:01 PM

iahte my ford4.2

Thread Starter

New User

Joined: Jan 2004

Posts: 15

Likes: 0

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