what should fuel injection pressure be at? - JeepForum.com

 
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post #1 of 2 Old 06-17-2013, 05:12 PM Thread Starter
JeepDude87YJ
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what should fuel injection pressure be at?

I was wondering what a 91 yj 4.0 fuel pressure should be at? Mine is at 30-35 running and 40 off. Is this bad? Thx


-87YJ 5.5'' Lift 33x12.5 BFG Mudders
Injected 258, Pacesetter header and Borla
cat-back, F 8.8 rear with 4 disc brakes.
-91YJ 5'' Lift 33x12.5 BFG Mudders
4.0 5spd,
-99WJ 4.7L with hitch to tow them all...
Also assorted CJ-7's and YJ's...
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post #2 of 2 Old 06-17-2013, 06:53 PM
idaholtby
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Quote:
Originally Posted by JeepDude87YJ View Post
I was wondering what a 91 yj 4.0 fuel pressure should be at? Mine is at 30-35 running and 40 off. Is this bad? Thx
For a 1991...Your pressure should be 31psi and then 39psi with the vacuum line removed from the regulator. If you see a ~ 8 psi increase with the vac line removed from the regulator, and your initial is as you described, then your fuel delivery is good and not likely causing an issue.
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