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Changing Fue Pressure Regulator on 1991 Sovereign Tomorrow

XJ40 ( XJ81 ) 1986 - 1994

Changing Fue Pressure Regulator on 1991 Sovereign Tomorrow

 
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Old 09-07-2018, 06:34 PM
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Default Changing Fue Pressure Regulator on 1991 Sovereign Tomorrow

91 Sovereign 4.0, hard cranks when engine is warm and making frequent stops and restarts... especially in hot weather (vape locking of sorts). Ordered a new regulator and it arrived today, installing Saturday morning.

Any tips, advice, warnings in swapping out to a new regulator? I know also installing a one-way not return valve is also recommended, I'm just gun shy on that (cutting/ splicing fuel line) and not clear on the right own to buy.

But anyway, I just want to focus on the FPR for now. Any tips are appreciated...
 
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Old 09-07-2018, 09:04 PM
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Tip: unplug the fuel pump relay with the engine running. That will allow the engine to conk out after a bit and also de-pressurize the fuel rail/regulator so you don't squirt fuel everywhere when you undo the regulator.

Other than de-pressurizing the line, replacement is pretty straightforward. Still a good idea to put a rag under the unit when you remove it as you will get a slight spillage of fuel when the union is undone.

Larry
 
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Old 09-08-2018, 06:28 PM
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So... what I fear with Doing it Yourself. Taking off the FPR I broke the Fuel Rail. So I'm done for right? The entire rail must be replaced now correct? The flanged/ flared connection broke off in the bolt.
 
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Old 09-08-2018, 06:30 PM
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Old 09-12-2018, 08:24 PM
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Ouch! How did you do that? I had no trouble at all with mine when I replaced the FPR last month in about 20 minutes.
Not a difficult job replacing the fuel rail. You will have to replace the seals on the injectors - two per.
Roger
 
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Old 09-12-2018, 11:05 PM
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Yeah,

IDK,... story of my DIY life. Things that come easier to you "quite mechanically inclined" types don't sometimes work with me....
Anyway, I can't find fuel rails that will come without the injectors, seals etc (checked Ebay, various Jag parts companies). My injectors are fine, I don't want to foot the bill for the entire assembly. So any resources on a rail ONLY would be appreciated...
 
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Old 09-12-2018, 11:21 PM
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Angry I Attempted To Create a Connection

I used the fitting in the pic to reestablish a fuel flow, but will not start. I assume the Fuel Pressure resulting from the fitting does not put out the correct fuel pressure required by factory settings. So will continue to hunt down a fuel rail...
 
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Old 09-28-2018, 05:00 PM
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Hey, jagbro. Did you find a fuel rail. I may have one if you still need it....pm me
 
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Old 09-29-2018, 11:26 PM
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Hi jagbro,

All of us have had something break that ruined our day, or week. Just in case it helps others to avoid this problem in the future, the fuel rail connections at the FPR and fuel inlet line must be disconnected and reconnected using two wrenches of correct sizes. Using only one wrench can allow the pipe on the other side of the junction to twist and break. Also, when reconnecting these fittings, the nuts must not be over-tightened - they just need to be snug. I hope Jerry is able to help you with a replacement rail.

Cheers,

Don
 
 
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