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Fuel pressure regulator

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ancientbugger Custom Title Time!

1,986 posts · joined Mar 2004 ·

#920376
Would anyone on here that's familiar with the factory FI system be able to tell me whether the standard FPR can be changed to an adjustable aftermarket type? I'm asking as I reckon trying to get hold of an original type may prove difficult. Plus would a failed FPR result in billowing black smoke and saturated plugs? (I have googled already , I just want knowledgeable VW folks input)

ian.mezz I never said, I could write or spell

3,913 posts · joined Sep 2004 ·

#920387
whats it look like, it could be the same as another make of cars.?/
Eg , VK commodore , Volvo etc.
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car forums. where a lot of peoples good intentions end up taking a good old car off the road forever never ever to see the road again. 🥲

ancientbugger Custom Title Time!

1,986 posts · joined Mar 2004 ·

#920391
Trying to post a pic but failing dismally but it's a standard looking Bosch regulator with one vacuum tube plus a fuel inlet and outlet

ancientbugger Custom Title Time!

1,986 posts · joined Mar 2004 ·

#920503
That is the right one Shane, but first I thought that maybe the diaphragm inside had split and so pure fuel was being pushed via the vacuum tube into the plenum but on checking this morning by turning on the engine and pulling off the tube the revs went up and no fuel came out, so now I'm thinking would a stuffed FPR be allowing too much pressure. To allow me to check the pump independently of turning on the engine I've wired it up to a switch rather than to the double relay but now I can start the engine even with the pump switched off but when I switch the pump on thick black smoke is produced so could the FPR be somehow blocked open, also with the pump off but engine running if I try to rev up it will cut out. Please excuse my ignorance but I'm really over FI and the longer this goes on the more a carburettor looks attractive.!

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 ·

#920517
Yes an adjustable reg will do, but it will need to be an EFI specific, and then set to suit your system. Type 3 is 28 psi, yours maybe 32, I'd need to check. I have the gear to accurately set, and yes, over pressure can cause major smoke
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

ian.mezz I never said, I could write or spell

3,913 posts · joined Sep 2004 ·

#920524
ancientbugger wrote:That is the right one Shane, but first I thought that maybe the diaphragm inside had split and so pure fuel was being pushed via the vacuum tube into the plenum but on checking this morning by turning on the engine and pulling off the tube the revs went up and no fuel came out, so now I'm thinking would a stuffed FPR be allowing too much pressure. To allow me to check the pump independently of turning on the engine I've wired it up to a switch rather than to the double relay but now I can start the engine even with the pump switched off but when I switch the pump on thick black smoke is produced so could the FPR be somehow blocked open, also with the pump off but engine running if I try to rev up it will cut out. Please excuse my ignorance but I'm really over FI and the longer this goes on the more a carburettor looks attractive.!
just need to check fuel presure with a in line gauge ,
when you pull vacuum line off it will rev up a bit as gives it more fuel. shouldnt be able to start any EFI car with no fuel pump.🤪
😂🤪😂🤪😂
car forums. where a lot of peoples good intentions end up taking a good old car off the road forever never ever to see the road again. 🥲

ancientbugger Custom Title Time!

1,986 posts · joined Mar 2004 ·

#920534
So to clarify, the engine starts but will only idle with pump switched off (I know it shouldn't but it does), a touch on the throttle it stops, so would the engine be sucking enough to get fuel through? It must be as the pump is off, would a stuffed FPR -allowing fuel through too easily - let this happen? If the pump is switched on it belches black smoke, again if the FPR is allowing too much fuel would this be the scenario?

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 ·

#920547
Thjere's more to it than just the reg IMO but fuel pressure is the easiest thing to check and always the first thing to do.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

ancientbugger Custom Title Time!

1,986 posts · joined Mar 2004 ·

#920667
As far as I can find (via google) the pressure should be 28psi