Quick Question - What fuel pressure?
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Elder User
Joined: Dec 2003
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From: Wayne, PA
Quick Question - What fuel pressure?
What fuel pressure do I want to be running.
I just installed a driven diesel regulated fuel system with bowl delete.
I am not sure what pressure I want it set at when the truck is at idle.
I do not have the ability to check at WOT yet.
Thanks
Ben
I just installed a driven diesel regulated fuel system with bowl delete.
I am not sure what pressure I want it set at when the truck is at idle.
I do not have the ability to check at WOT yet.
Thanks
Ben
Elder User
Joined: Jun 2012
Posts: 536
Likes: 2
From: N. Va.
My .02... I have a 01 F250. I jacked it up (via fuel return springs) to about 65psi but noticed longer crank times. Dropped it back down to stock (about 55psi) and it fires noticeably quicker. Not really sure why the added pressure would cause longer crank times. Anybody?
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Hotshot
Joined: Jan 2011
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From: Puget Sound
My .02... I have a 01 F250. I jacked it up (via fuel return springs) to about 65psi but noticed longer crank times. Dropped it back down to stock (about 55psi) and it fires noticeably quicker. Not really sure why the added pressure would cause longer crank times. Anybody?
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Elder User
Joined: Jun 2012
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From: N. Va.
No, not cavitation!
That word, cavitation! Man it just ranks right up there with venereal disease for us PS guy's 
. Where and how could cavitation play a roll here do you think?
I will add that when I was changing fuel pressure back to 50-55psi I was draining the fuel bowl a little and noticed the fuel was Red. Come to find out I put 20gallons of Red Dye Diesel from Southern States. I pumped the fuel from the same pump everyone else was pumping from. A guy in a F350 was in front of me.
No Hutch Mod yet. I checked my fuel pressure and it's good at idle (55psi) and WOT.
. Where and how could cavitation play a roll here do you think?I will add that when I was changing fuel pressure back to 50-55psi I was draining the fuel bowl a little and noticed the fuel was Red. Come to find out I put 20gallons of Red Dye Diesel from Southern States. I pumped the fuel from the same pump everyone else was pumping from. A guy in a F350 was in front of me.
No Hutch Mod yet. I checked my fuel pressure and it's good at idle (55psi) and WOT.
Hotshot
Joined: Jan 2011
Posts: 18,849
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From: Puget Sound
I'm stretching to answer the question "Why slower starts with more fuel pressure?" I do know one thing: Fuel doesn't compress, but air does. If the fuel pump were to introduce air, you lose a little fuel flow. More importantly... air in the injector compresses when the oil hits the top side of the plunger. The "give" from that compression has oil chasing the plunger down... diminishing your ICP, as well as reducing the quantity of fuel delivered. If you ever want to get a pump to cavitate... increase the backpressure past a certain threshold. I'm not guessing on that one piece of physics.
Post Fiend
Joined: Sep 2003
Posts: 6,096
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From: Mesa AZ
My .02... I have a 01 F250. I jacked it up (via fuel return springs) to about 65psi but noticed longer crank times. Dropped it back down to stock (about 55psi) and it fires noticeably quicker. Not really sure why the added pressure would cause longer crank times. Anybody?
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