Quote:
Originally Posted by Seagull81
I need a little help with a fuel issue. I have a stock injected 302 (stock FPR) with a Mustang tank and pump. While working on the engine I noticed the fuel pressure at 30 pounds. It used to be 39 or 40 pounds. If I take the vacuum line off the regulator the pressure goes up to 39 pounds again. Is that the pump or the regulator that is not working correctly? I am guessing the regulator, but I thought I would get y'all to comment.
Thanks,
Steve  |
It may be just that your regulator is manifold vacumn compensated. The idea behind the vacumn connection between your regulator and the manifold is to alllow the regulator to keep the pressure difference across the injectors constant. When your intake is under vacumn, the injectors need less fuel pressure to deliver the same amount of fuel. When you took the previous readings at ~40 lbs, were you using the same regulator? Were then taken with the engine running at the same vacumn level as the more recent ones?