Fuel Pressure Regulator

[Bob Jones]

Hmmm…..Can't make heads or tails of my Replacing fuel lines on my '76 2.0L and don't remember how the fuel pressure regulator is hooked up. Does the return line back to the fuel tank connect to the end of the regulator (opposite of the adjustment screw) or does it connect to the side outlet or does it matter?

Thanks for the help.


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[jmcleod]

it matters huge!!! i can't exactly remember which outlet/inlet to attach which hose to but if you could get a x-section of a fpr, you could easily see how it works and figure out it works. there is a spring pushing on a ??? plate? face? something that closes off the inlet tube. if the fuel pressure is greater than the pressure exerted by the spring, it pushes back the face and bleeds off fuel pressure (so i guess i figured out what i forgot, sorry- de-caf!) the inlet and after the fuel rail should be directly across from the adjusting bolt/screw. the outlet to fuel tank off perpendicular to that direction. i think this is correct. someone confirm this info???

[jmcleod]

it matters huge!!! i can't exactly remember which outlet/inlet to attach which hose to but if you could get a x-section of a fpr, you could easily see how it works and figure out it works. there is a spring pushing on a ??? plate? face? something that closes off the inlet tube. if the fuel pressure is greater than the pressure exerted by the spring, it pushes back the face and bleeds off fuel pressure (so i guess i figured out what i forgot, sorry- de-caf!) the inlet and after the fuel rail should be directly across from the adjusting bolt/screw. the outlet to fuel tank off perpendicular to that direction. i think this is correct. someone confirm this info???

[Dave at Pelican Parts]

The following diagram is available under "EFI Hose diagrams" on the main Pelican page. If you look, you can see that the fuel rail hooks up to the end port on the FPR. The side port goes back to the return line.

And yes, the FPR is a spring-loaded valve.

--DD

[Bob Jones]

Thanks for the help.
The confusion (read: OLD Age) really shifted into high gear when I looked at the diagrams. Pete Klager's diagram shows the regulator hooked up the opposite of Dave's diagram. Is it possible that the regulators are different between the 1.8L and the 2.0L?

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[JP Noonan]

I think the 1.8L FPR is of a later style that also gets a vacuum signal from the engine, i.e. there is a vac line to the gauge along with the two fuel lines.

[Jim Smolka]

I too am in the process of hooking up my rebuit FI 2.0 Engine...

A couple of suggestions. Please lable the high pressure inlet and the return lines. Also, could you show the lines comming out of the tunnel on later cars...

Thanks again...

Jim

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Smoke Daddy

[jmcleod]

i think the 1.8 i L-jet and the fuel pressure reg is hooked up some way so that the fuel pressure increases when demand is high (stomping on the accelerator) that's why the 1.8 fpr has a vacuum connection to it. my vanagon is "L-jet" (my 914 is D-jet)

[Jim Smolka]

I did so experimenting this weekend when I was connecting up my 2.0 fuel lines...

According to the Probst Bosch book, and the results of my testing, the high pressure side connects to the side of the FPR and the return line connects to the end. This allows the extra fuel to go thru the return line.

Note: This is different than the drawing seen above. I tried connecting as shown, and fuel was returning to the tank.

DD, could you please review the FPR information

Thanks...



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Smoke Daddy

[Dave at Pelican Parts]

Sho' enuff! In the side, out the end! I musta been drinking decaf when I made the diagram originally. I'll have to correct that! Thanks for pointing it out to me. I've been meaning to add a couple more things to the diagram; things like flow arrows (or labels or some such) and an explanation about the vaccuum advance which is missing from some 74+ cars...

This should give me that needed kick in the pants! ;^)

--DD