'95 D-90; fuel pressure regulator trouble, stalling - Defender Source
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  #1  
Old June 25th, 2016, 10:13 PM
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Paul Koentges
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'95 D-90; fuel pressure regulator trouble, stalling

Intermittent stalling (totally dies), thought it was electrical as it seemed to occur over bumps, thought it was inertia switch, bypassed it...no luck, ECU does not throw a code; replaced fuel cap as the tank seemed to have a lot of pressure. It mostly happens 4-wheeling or when outdoor temps are very high; acts as if no fuel, won't start. If I hammer (lightly) on the fuel pressure regulator, it will start...usually after a minute or so. I replaced the regulator with a used one out of a '95 classic...same problem. Any thoughts before I purchase a new one without really knowing if that is the cause?

thanks,
Paul
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Old June 25th, 2016, 11:23 PM
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Have you checked for vacuum leaks? It can cause stalling issues
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Old June 26th, 2016, 07:32 AM
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Paul Koentges
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yes, but I will check again...is the best method to spray carb cleaner around while engine is running? It happened twice this last weekend, once backwoods and once after driving 50 miles at highway speed; slowed down at a stop sign and it stalled. I will check for fault codes again. This has been a reoccurring problem over the last couple of years, MIT could not diagnose either.
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Old June 26th, 2016, 08:19 AM
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Clean your AICV first - its how the engine controls idling ... take it out and clean it with carb cleaner and a small brush.

Check the big hose for leaks ... they rot out underneath and that would contribute but not necessarily cause the issue ... unless the hose was coming loose.
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Old June 26th, 2016, 11:45 AM
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Quote:
Originally Posted by leastonce View Post
Clean your AICV first - its how the engine controls idling ... take it out and clean it with carb cleaner and a small brush. Check the big hose for leaks ... they rot out underneath and that would contribute but not necessarily cause the issue ... unless the hose was coming loose.
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Old June 26th, 2016, 12:00 PM
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Quote:
Originally Posted by PMKColorado View Post
Intermittent stalling (totally dies), thought it was electrical as it seemed to occur over bumps, thought it was inertia switch, bypassed it...no luck, ECU does not throw a code; replaced fuel cap as the tank seemed to have a lot of pressure. It mostly happens 4-wheeling or when outdoor temps are very high; acts as if no fuel, won't start. If I hammer (lightly) on the fuel pressure regulator, it will start...usually after a minute or so. I replaced the regulator with a used one out of a '95 classic...same problem. Any thoughts before I purchase a new one without really knowing if that is the cause?

thanks,
Paul
Try this, detach the return hose off the pressure regulator. Have someone turn the key on for a moment. Does fuel come out ? Regulator is set to open around 45 psi or so. I recently had a similar problem where the cap was making noise when I unscrewed it as well. On mine there was no fuel out of the regulator. The pump had come partly apart in the tank and was barely making enough pressure
to push past the regulator. The regulators seldom fail.
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