Stock fuel pressure on a 95xj 4.0 auto????

95cherjustin · Sep 14, 2009

Still having my engine problems too at start up so i checked fuel pressure and no matter how crappy she runs when cold fuel pressure is always around 35psi at idle with my brand new 6) bosch fuel injectors.

Is 35psi for a 95 xj correct, i searched but didnt search well enough i cant find specs on this.

joe_peters · Sep 14, 2009

For your 95 should be 30 psi w/vacuum to regulator; 39 psi w/o vacuum to regulator.

95cherjustin · Sep 14, 2009

Yea i checked again i am at like 34.5 psi of fuel RAIL pressure at idle. Should i get a new regualtor>?

Or do i have a vacuum leak?

joe_peters · Sep 15, 2009

95cherjustin said:
Yea i checked again i am at like 34.5 psi of fuel RAIL pressure at idle. Should i get a new regualtor>?

Or do i have a vacuum leak?

What psi do you get with the vacuum disconnected?

95cherjustin · Sep 16, 2009

Alright i was off the 1st time.

My fuel pressure last night at idle was 32 psi

Then i disconnected vacuum line off brake booster and it jumped to 40psi at idle.

So am i good or still a tad high??

joe_peters · Sep 16, 2009

95cherjustin said:
Alright i was off the 1st time.

My fuel pressure last night at idle was 32 psi

Then i disconnected vacuum line off brake booster and it jumped to 40psi at idle.

So am i good or still a tad high??

I would say close enough, allowing for gauge variance.

Stock fuel pressure on a 95xj 4.0 auto????

95cherjustin

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joe_peters

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95cherjustin

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joe_peters

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95cherjustin

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joe_peters

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