FUEL PUMP/SYSTEM ISSUES

[NOKA72]

whats up guys...have some trouble...i noticed that when i have the car out for a while and its nice and hot i seem to have a drop in fuel pressure...a loss of at least 6-8 lbs if not more....give it a lil throttle and she comes up...let it idle or i sit at a light and she comes down....i ran a meter to the rear and drove it around and voltage stays up there...the little variance i see, i feel will not cause any pressure drop.....this pump i am using is a walbro from full throttle i bought a couple of years ago...less than 1k street miles....kind of thinking i might just change it out....any thoughts before i do so?????thanks vinny

 

[Boost231]

hows your ground at the pump?

 

[TurboBuRick]

Liquid filled rail mount gauge?

 

[NOKA72]

hey guys..yes liquid filled guage at the rail and it matches my guage in the car so im pretty confident in the readings i am seeing...boost231 are you talking about the connections at the pump in the tank///what other grounds did i miss???

 

[Boost231]

both in tank and out of the tank. just make sure you have good grounds

 

[Underboost]

A couple years ago Walbro did have some problems with their pumps. If all grounds are good and there's no intermittent voltage drop to the pump you might want to get yourself a new pump. "Cheap insurance"