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Replacing Fuel Inj Pressure Regulator
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Fixit53
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Jan 31, 2010, 1:14 PM
Post #1 of 6
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Replacing Fuel Inj Pressure Regulator
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I have a 1998 Isuzu Hombre pickup. 2.2L 4 cyl eng with automatic tranny. It has 114000 miles, 14k of these on a new transmission. Was misfiring and running very rough and we replaced a clogged catalytic convertor. Ran fine for a week, now same roughness - diagnosis by repair shop says 80# pressure from fuel pump and needs regulator.
Is 80# in the acceptable range? Is there a fuel injector regulator for each cylinder or one for the system? How do I install the regulator?
Fixit53
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Sidom
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/ Moderator
Jan 31, 2010, 3:42 PM
Post #2 of 6
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Re: Replacing Fuel Inj Pressure Regulator
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That pressure is too high and could be the cause of your 1st cat going out. Spec are 41 to 47 psi regulated pressure.
The regulator bolts on to the end of the fuel rail and is fairly easy to replace. One thing to double check is the return lines to make sure it isn't blocked or kinked, that to will give you very high fuel pressure....
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Fixit53
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Jan 31, 2010, 5:17 PM
Post #3 of 6
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Re: Replacing Fuel Inj Pressure Regulator
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Is the fuel rail separate from the upper and lower intake manifold? Should the regulator replacement take care of the pressure so that a fuel pump doesn't need replaced at this time?
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Sidom
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/ Moderator
Jan 31, 2010, 5:45 PM
Post #4 of 6
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Re: Replacing Fuel Inj Pressure Regulator
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The rail is separate from the manifold but the upper one may have to be removed to access it.
As far as the fuel pump goes, having to put out that type of pressure has been twice as hard on it, similar to running around with a restricted fuel filter so only time will tell if this has taken a toll on it..........
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Fixit53
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Jan 31, 2010, 5:52 PM
Post #5 of 6
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Re: Replacing Fuel Inj Pressure Regulator
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 Thanks!! I'll give it a shot. I've replaced a bunch of the little stuff like alternator, belts, battery that I don't want to part it out yet! Thanks,again!
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Fixit53
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Feb 26, 2010, 5:18 PM
Post #6 of 6
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Re: Replacing Fuel Inj Pressure Regulator
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 Thanks for all of your advice! With three boys and all their cars and my full time job, I just got it fixed. The regulator went in without removing the upper manifold. It was at the firewall side of the rail and I was able to reach it without too much trouble. Thanks, again!!
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