Today I was doing some work on my car and I had to remove the fuel return line off of the fuel pressure regulator. So like 30 mins go by and it starts spraying gas out of it for like 10 seconds and stopped. Is it supposed to do that? I thought that the return side was not supposed to bo pressurized. The car has not been started for a week and the battery terminals were removed before I started doing the work on it.

Walbro 255
pressure is 47-50psi @ idle
pressure is 52-55psi with vac hose off

 

Why do your pressure readings have such large ranges?

Connecting the FPR vacuum hose typically drops the fuel pressure 10 PSI, so the return line may be clogged.