Erratic fuel pressure
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Cargo Master
Joined: Mar 2010
Posts: 2,227
Likes: 149
From: Higginsville, MO
Erratic fuel pressure
So my buddy just installed a fuel pressure gauge in his 97. The pressures are pretty erratic. I'll attach a short video. The video is of a full load acceleration and some highway driving after warming up. On occasion the pressure will drop to 15psi under hard acceleration. The pressures will at normal operation jump between 40-60 psi. His truck still runs the normal mechanical fuel pump.
What would cause the erratic pressure during normal operation? FPR going bad was my thought but wanted a second opinion. The high load dropout will likely only be solved through efuel im sure...
What would cause the erratic pressure during normal operation? FPR going bad was my thought but wanted a second opinion. The high load dropout will likely only be solved through efuel im sure...
Senior User
Joined: May 2013
Posts: 208
Likes: 0
My factory pump produces 45 to 50 psi no matter what the throttle position. If it were to fall to 15 under heavy throttle, I'd suspect the pump is beginning to fail. Or, perhaps a restriction in the fuel system such as a clogged fuel filter.
Lead Driver
Joined: Apr 2016
Posts: 7,180
Likes: 1,336
From: Bahstun
under 40 psi and you will starve the injectors which can make them knock
I tried bb mod and ended up using a new stiffer spring since the old spring bent under pressure
could have trash in tank, broken shower head in tank, pinched line, bad pump, filter not changed in 10k or clogged, algae in tank, fuel selector not switching all the way, clogged FPR screen
I tried bb mod and ended up using a new stiffer spring since the old spring bent under pressure
could have trash in tank, broken shower head in tank, pinched line, bad pump, filter not changed in 10k or clogged, algae in tank, fuel selector not switching all the way, clogged FPR screen
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