The Buick in my sig started to lean out on the dyno a little in the upper RPM's, so we put a fuel pressure gauge on the car to see if the pressure was dropping. To our suprise, the engine was seeing 80 PSI (!) of fuel pressure at idle, and it drops all the way to about 42 in the upper RPM's at WOT.
I double checked the pressure with another gauge, and sure enough the engine is seeing 80 PSI of fuel pressure at idle. I replaced the regulator this weekend with no change in pressure.
I figure something must be clogging/blocking the return line. Any advice on where to start looking for that? I checked the rubber line beneath the regulator for kinks and didn't find anything.
Anyone got some idea's on where to start looking?
I double checked the pressure with another gauge, and sure enough the engine is seeing 80 PSI of fuel pressure at idle. I replaced the regulator this weekend with no change in pressure.
I figure something must be clogging/blocking the return line. Any advice on where to start looking for that? I checked the rubber line beneath the regulator for kinks and didn't find anything.
Anyone got some idea's on where to start looking?