Join Date: Mar 2007
Location: Batesville, IN
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Fuel pressure mod, how much is too much?
Can someone tell me how much fuel pressure is too much? I did the bb in the fuel pressure regulator mod on my truck. (95 F250, 7.3L, ext. cab, 4x4, E4OD). I don't remember exactly what the stock pressure was but it increased to about 60 psi @ idle. I was expecting 70 so I put another bb in it and the pressure increased to about 70.
Now, just to clarify, I am estimating these figures due to the fuel pressure gauge bouncing between numbers. These figures are midpoint readings.
I installed a 100 psi gauge and after a couple of days the gauge started leaking. The gauge was under the hood so I could not monitor it while driving.
Then I decided to do the DIY stage I injector rebuild, cat delete, and 3" downpipe plus a couple of other minor mods. During the rebuild I replaced all fuel lines in the valley of the engine and found the fuel pump leaking from the weep hole and I replaced it also.
After completing all this, I installed another 100 psi gauge and the reading was bouncing between 60 & 80 psi @ idle. That gauge lasted about200 miles and then it started leaking also.
Now, I have installed a 200 psi gauge onto a 4 ft. hydraulic hose and run it out onto the hood using a magnetic base and clamp. The needle is pretty steady now and reading 85 psi @ idle. 90 - 95 running 60 mph and the pressure increases whenever I let off the throttle and decreases to 80 or so when accelerating. I saw 150 psi momentarily with overdrive locked out and hard acceleration and then quickly backing off the accelerator.
I'm sorry this is so long but I wanted to make sure you could understand what is going on and what led to this.
Finally, here is my question! Can it take the pressure? Should I go back down to 70 psi @ idle or is it just personal preference to what pressure to run? Will this pressure harm any thing?
BTW, the truck starts and runs good but I haven't checked mileage yet.
Any info or comments are greatly appreciated. Just concerned whether any harm is being done.
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