D-Jet Fuel Pressure Regulator, How high should it go? Options

[GregAmy]

What should be the maximum capability of the stock D-Jet pressure regulator? Mine only goes to 36.

If that's normal, is there another similar-format regulator that can go up to around 45psi?

Background: Microsquirt project. Was hoping to use the stock regulator, but now need something that I can easily mount in the same location, if possible. Injectors I'm using are rated at 43.5psi.

Discuss!

[GregAmy]

Quick update... per Summit Racing, MSD has discontinued the MSD-2220.

Rock Auto has the Delphi version, says it's 29psi.

I tried two used ones from Chris; one only got to 34psi, the other had the locking nut stuck so I didn't force it.

NAPA can get me a "FPR for the Porsche 914" but it's special-order only, and they don't know how adjustable it is.

Rock Auto looks like the Delphi version as well, 29psi listed.

I can't find a FPR for the car on Pelican's web site.

I'm guessing that if I'm running more than 35-36 psi I'll have to go aftermarket on the FPR...

[JamesM]

Didn't have time to tear into one this weekend but from the looks of the diagram im wondering if MSD didnt get to higher pressure via a longer adjustment screw. Would need to measure how much more could be added before the coils bind. From the drawing though I would think you should be able to dead head the pump with a long enough adjustment screw

Not sure when the last production run would have been, but guessing at 50 years old the OE springs may be getting a bit tired.

[JamesM]

Just did a bit more searching... this is an interesting read on the pressure regulator

https://www.thesamba.com/vw/forum/viewtopic...s+inside++fails

Cant tell for sure but it looks like the adjustment screw may be a custom part, so swapping may be out of the question. Also looks like new ones from anywhere may have gone NLA sometime over the last couple years and if that post is to be believed these have a high potential for wear that will affect every used one out there.

May be time to look at other options

[JamesM]

Knowing that 914 l-jet regulators are a direct swap (fitment wise) I started exploring what might be out there the the realm of cars that used similar systems.

914 L-jet regulators are non-adjustable, vacuum referenced and is supposed to give ~37-38 with zero vacuum. Those can still be had available new but isnt quite where we want to be...

Vanagon regulators are similar pressure wise


and then by some random luck i stumbled on this...

Bosch 0 280 160 256

vacuum referenced, 3 bar non adjustable. Would need an adapter on the inlet but other than that appears to be externally similar to a stock regulator.

https://www.amazon.com/gp/product/B00C818WG...45-cd78f07a84d8





This has some interesting candidates as well though i am not sure where they can be purchased. FPR 05-40 B (adjustable from 0.5 to 4 bar) and FPR 15-50 are of particular interest.

https://www.bosch-motorsport.com/media/down...minikatalog.pdf