2nd Gen Non-Engine/Transmission fuel presure gauge question

[MJaynes]

fuel pressure gauge reads higher with lights on... and now, with new spray in bedliner,alot higher... but only with headlights/pk. lights on. reads normal with lights off. any ideas on a fix? gauge is westach from genos. has the sender that came with it... sender is clamped to inner fender... anyone have any ideas?

this is bugging me... thanks in advance

 

[TMills]

I have the same problem with my westch unit. With lights on the gauge will read 1~2 psi more than what it reads with the lights off.

 

[gonehuntingagain]

After reading this post, I had to check. My FP goes up as well when the lights are on as well... . Is it the FP gauge or is it the pump? Can anyone with a non-electric gauge verify?

 

[DieselMinded]

I checked mine (Mechanical)



And it dont change any .



I have a bed liner too>



DM

 

[Crash&Burn]

My Westach does the same thing... . It reacts to voltage changes, the cycling of the grid heaters make the greatest difference... .

 

[Tcolesanti]

My fathers Westach f/p gauge did that, move the ground to a better location and ground it by itself, it will clear up.

 

[MJaynes]

fixed pressure gauge

i moved the ground as suggested and this seems to have fixed the problem.

thanks,mike

 

[CYauch]

Just installed a 0 - 30 pi westach gauge also. have a wire going from the gauge, to the sending unit, then to the fire wall for ground. Other goes to the fuse panel where pwr is on when the ignition is turned. Have noticed that the gauge bounces all over the place whether the lights are on or off. Highway driving, cruise set, pressure stays around 12 - 14. However, constant stop and go, thing drops to 6 - 10, but will kick up to 12 -14 if i mash the accelerator hard and quick. Sometimes, it will even drop to 0 and stay for a little while, then jump back up to 12 or so. The gauge, sending unit, and the chrome filter cap came from Geno's. I'm thinking that its an electrical problem, the connections, but looking for other suggestions if any before i go doing any continuity checks ( I thought going straight to the firewall wall would be the best ground anyway. Should i go to the engine block itself? Does it when engine is cold or hot too. and what is the normal pressure? life pump was replaced a few months ago along with the injection pump (bad fuel from Cone). 70,000 miles. Thanks again.