Pierburg Fuel Pump & Bosch Regulator

[Alex D]

Hi,

For those that have the Pierburg 7.21287.53.0 fuel pump and Bosch 0 280 160 001 regulator set up, which I currently have, we can not get the regulator to reduce the fuel pressure below 2.1-2.2 bar (30-32) psi.  If you turn the regulator screw any lower it will come out.  Trying to get the fuel pressure to 1.2-1.5 bar (17-20 psi) Could it be a bad regulator?  Any thoughts from anyone who has this set up?

Thanks,
Alex

[Shvegel]

Curious if you have checked your cold start valve for leaks? 

[rumb]

That regulator only adjusts down to 36 psi. Perhaps you need a different regulator.


"If the fuel system pressure needs to be adjustable, better is this Bosch 0 280 160 001. It’s used in the very old Bosch D-Jetronic system. (You’ll find it one the VW Type III 1968-1973, Porsche 914 1970-1976 1.7L or 2 litre, Saab 1969-1974, Volvo, and Renault 1972-1974.) Nearly 40 years after it was first produced, this regulator is an ideal upgrade for returnless fuel systems. It’s still widely available from fuel injection specialists and costs just AUD$77.

The adjustment screw of the D-Jetronic reg allows variation in the fuel pressure from 2.5 – 3.1 Bar (36 – 45 psi), which is enough range for most returnless fuel systems. However, if you remove the jam nut and so allow the screw to be turned further inwards, fuel pressure can be j-u-s-t lifted to 50 psi – any higher and the pressure starts to fluctuate."

[WRe]

Hi,
Why not use a Pierburg pump with correct pressure and w/o regulator, e.g. Pierburg E1F (7.21440.78.0) ?
See https://www.sl113.org/forums/index.php?topic=23448.msg167821#msg167821.
...WRe

[Shvegel]

WRe,
The setup in Alex's car is one of my projects.  The concept is to retain fuel in the injection pump under pressure with a small reserve rather than relying on the delivery valves (outlet valves) of the pump.  The factory delivery valves are not only prone to leakage but they are no longer available.