ok i have a mechanical FP gauge mounted in my cowl induction hood. was messing with the car today trying to solve soem cooling problems.
hopped in the car to drive around and i noticed my fuel pressure was jumping around.
the FP would hang around the correct pressure, around 39 psi, and pressure would increase and decrease like normal with engine vacuum. but instead of beind rock solid. the FP would bounce around abour 2-3 psi on what it should.
for ex say it should be 39 psi, the needle will shake from like 37-41 psi. give it throttle and it would increase slightly but still have the 2-3 psi shake to it.
got home and when the engine settled down to and idle the FP really went crazy. jumping from like 30-45 psi.
the needle shaking is VERY fast.
car seems to run fine.
popped the hood and checked my braided line coming from the fuel rail to the gauge and i found no leaks. i couldnt see anything wrong around the engine compartment.
i duno what would cause this.
only thing out of the norm i did recently was burping the cooling system for a while.
i had my car running at idle for about 30 mins with the drivers side jacked up trying to get as much air out of the system as possible. but i dont see how this could cause this problem. i dont know if its been doing it for a while now. i have only driven the car a few times in the last week or so. i havent noticed anything until today.
the fuel pump is a 255 LPH i replaced a month or two ago the pump doesnt have 500 miles on it. i dont see how it could be bad, i got it from summit (summit brand) its a walbro pump.
maybe fuel filter? its been a while since i have changed that....
any more ideas? this is the first time i have ran into a problem like this. at least since i have had the mech FP gauge. since i first got it my FP would be rock solid and move smoothly now its jumping around like its on speed lol.
hopped in the car to drive around and i noticed my fuel pressure was jumping around.
the FP would hang around the correct pressure, around 39 psi, and pressure would increase and decrease like normal with engine vacuum. but instead of beind rock solid. the FP would bounce around abour 2-3 psi on what it should.
for ex say it should be 39 psi, the needle will shake from like 37-41 psi. give it throttle and it would increase slightly but still have the 2-3 psi shake to it.
got home and when the engine settled down to and idle the FP really went crazy. jumping from like 30-45 psi.
the needle shaking is VERY fast.
car seems to run fine.
popped the hood and checked my braided line coming from the fuel rail to the gauge and i found no leaks. i couldnt see anything wrong around the engine compartment.
i duno what would cause this.
only thing out of the norm i did recently was burping the cooling system for a while.
i had my car running at idle for about 30 mins with the drivers side jacked up trying to get as much air out of the system as possible. but i dont see how this could cause this problem. i dont know if its been doing it for a while now. i have only driven the car a few times in the last week or so. i havent noticed anything until today.
the fuel pump is a 255 LPH i replaced a month or two ago the pump doesnt have 500 miles on it. i dont see how it could be bad, i got it from summit (summit brand) its a walbro pump.
maybe fuel filter? its been a while since i have changed that....
any more ideas? this is the first time i have ran into a problem like this. at least since i have had the mech FP gauge. since i first got it my FP would be rock solid and move smoothly now its jumping around like its on speed lol.