Went to fire up my wagon this morning and ended up with fuel eveywhere. The car didn't want to start at first then finally did. Smelled fuel so I shut it down and popped the hood. (Unhooked battery) Noticed fuel leaking badly out of the fuel pressure regulator at the connection where the regulator gets fuel from the fuel rail. This regulator was replaced 50,000kms ago. Is there a gasket in there somewhere that has failed. I usually pull the small hose and smell for fuel as precautionary maintenance when under the hood. Do fuel rails ever crack? I've never replaced a regulator before myself but I willing to give it a go. Help

You guys just made me go out and undo my regulator that I just installed in search of an O-ring which it didn't have. The old one did't either.

Not to hijack this thread, but does the 84 LH2 regulator use an O-ring?? The fuel fitting on my 84 has a tapered compression looking surface that wouldn't take to an O-ring readily. Same fitting also used at the rail/fuel line connection and also without an O-ring.

No O-ring for you. Wait until 88.
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-K (hope springs eternal)

Didn't look forward to another cross town trek in search of a single o-ring. double thxx kyle.

As said below by SM, the FPR O-ring is the same one used on the injectors. I assume he means LH injectors, which opens more possibilities.

Don't know why but there are 4 different LH FPRs according to FCP's listing:

'82
'83-'87
'88
'89-'93
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Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

There are two different configurations (old no O-ring and new w O-ring) and two different pressure ratings for each type. Haven't a clue why there are different pressure ratings? Dan

"Don't know why but there are 4 different LH FPRs..."

Yes, I can understand some evolution, but what about that Regina regulator that costs twice as much but is fit/form/function (we hope) same as the Bosch for LH2.4.

I hosed a Regina by taking it apart and pushing it back together without lube. I used a k-jet injector O-ring if I'm not suffering from CRS again. The old o-ring was pretty hard; I guess it didn't take to being disturbed. On second thought, maybe it was the LH O-ring I grabbed. Did you see that recent post about finding a threaded FPR on a '93? Regina Hybrid??

Thanks for the reminder about silicone. I tend to use that dielectric grease or Sil-glyde without thinking.
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Art Benstein near Baltimore

If you can't be kind, at least have the decency to be vague.

The conventional wisdom that any silicone in or around the fuel system has the potental to contaminate the O-2 sensor.

I would play it safe and use vaseline or any plain auto grease.
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.

Yes - there's an o-ring in there.
I tore one of those once when I jammed the FPR into the fuel rail without paying any attention to the o-ring. Ring is slipped onto the end of FPR so it will come out when you pull the FPR.

I suppose a fuel rail can crack but I'd suspect a failed o-ring first. The connector to fuel rail is pretty beefy. Inspect it and the nearby rail after you get the FPR out of there.

You can put a rag under the FPR and unscrew it for removal.

The o-ring is the same one used for the fuel injectors. With that information you can get the o-rings at a parts store. I'd call first to make sure they have it - a large chain like AutoZone might not stock it but a "real" parts store should. The fuel injectors are by Bosch.

Anyway, two screws or nuts hold the FPR in place. If I recall the connection to the fuel hose is a typical hose clamp.

The o-ring needs to be lubed so it will slide in nicely. You can use silicone brake lube or even a little dab of vaseline. Or maybe even dip a fingertip in some regular motor oil, just a tiny bit. Lube just slightly because the stuff will end up in the fuel system, however if I understand correctly it goes from there back to the tank - not directly to the injectors. Use just enough to put a little shine on the rubber.

Help the male end go in straight. Don't just crank on the screws/nuts and expect it to go in - I bent the mount bracket doing that.

--
Sven: '89 245 NA, 951 ECU, open-front airbox, E-fan, 205/65-15's, IPD sways, E-Codes, amber front corner reflectors, quad horns, tach, small clock. Wifemobile '89 245 NA stock. 90 244 NA spare, runs.

This just happened out of the blue after 50,000 Km? I'd expect something like that from rough treatment, but not untouched. There's a fat o-ring between the rail and regulator, that I would expect to have complained much earlier if it was twisted or folded when last replaced. Have something slippery on it when you change it next time, and of course, inspect for cracks in the metal.
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-K (hope springs eternal)

Had mine changed two weeks ago. Hose clamp on one side and a hard rubber o ring on the side that gets secured with the screw. Put some grease and spray it with silicone and push hard and it will go in. Friend is a newly retired Volvo mechanic of 30 years. Was the fuel coming out the end with the vacuum hose. If it is while cranking or running then the diaphram is shot. Goood luck Dave.

No the diaphram is not leaking fuel. I will pull the regulator an hope it's a o-ring. Yes it did this out of the blue.