Fuel Regulator
Turbo Mini Forums

My fuel pressure regulator doesn't want to adjust to anything below 6-7 PSI
It will go up to about 9PSI but wont come down, pipe the plenum is ok
is it knackerd or could it be something else?

When your fuel return line is too restrictive you can't adjust the pressure as low as you need it. What ID does your feed and return line have?

Bimmer Twinky headed and turboed A-Series:
http://www.minifreunde.at/harry/projects.htm

yep, think you'll find that there is too much restriction in the return as Dave found out for our benefit!

put a restriction in the supply to the regulator so that the return is "effectively" bigger.

what diameter fuel pipe would you suggest to use for the reurn ?

I've got 8MM ID both ways.

It'd be better to increase the return to 10 as opposed to restrict the feed wouldn't it?

Should be ok with a restriction but if you want to increase the return then that would work aswell.

IIRC metro was 5/16 and 3/8 return.

on my min i put in 8 mm from the pump to the reg and 10 mm from the reg back to the tank like it is on the metro all worked fine got it down to 3 psi

I changed to feed 6mm ID and return to 8mmID and can adjust down to 1,5psi now.

Before I had 6mm ID feed and return and the minimum setting was 3,75 psi, which was still ok but not as it should be!

Bimmer Twinky headed and turboed A-Series:
http://www.minifreunde.at/harry/projects.htm

cheers all

I'll have a go a restricting the feed first, sounds easyer

I'll replace the return next time I take the car to bits
on current form it probably wont be long

Found out what my problem was

The return in the top of the tank looked big enough but when I took the pipe off I found out the the ID of the barb was only 3MM!!!
The outside was 9MM F*CK knows what that was off

Fitted a new one with 7MM ID

pressure will now adjust down to 3.5PSI

Previous Owner bodge