so i drove home from work today and my FP gauge read 2-2.5 PSI, needle doesnt move at all, FASS connections are good, when i unplug gauge the needle drops to 0 and back to 2 PSI when plugged back in, not sure what to do

 

Verify with a mech inline gauge.... Hate to fry the VP over something dumb...

 

Mechanical or Electrical Gauge?

 

elecrical, im thinking its possibly the sending unit as i have no power loss in truck at all and the needle didnt MOVE at all on the way home, not even at nearly WOT.

 

If you have no fuel pressure its not a very good idea to drive at WOT. Undo the line on the sender and reinstall it. make sure you have a good ground (bare metal) on the sender and guage.

 

the sending unit is connected between an 18" grease line and the electrical plug. WHat would undoing line on sender do?

 

it would in a sense reset it.

 

ok well, i did a mechanical gauge test the day after,, gauge read 15 psi, did further testing and contacted Auto Meter. Found the issue to be bad sending unit caused from an insufficient style of snubber valve, AutoMeter replaced sending unit free of charge and i had to buy an autometer brand snubber valve, which is actually a LOT different than the original snubber i had installed.

original snubber came from genos garage and had an "open" bottom, AM snubber had a solid metal bottom but still reads pressure.

 

Thats great glad it was nothing serious

 

me too!