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Unread 06-17-2013, 06:12 PM   #1
JeepDude87YJ
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Join Date: Apr 2004
Location: Kingston, MA
Posts: 13
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

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Unread 06-17-2013, 07:53 PM   #2
idaholtby
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1991 YJ Wrangler 
 
Join Date: Apr 2008
Location: Meridian, Idaho
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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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