fuel pressure trouble is it the cold??

**jimmyz32** · #1 (**permalink**) 12-15-2010, 03:28 AM

fuel pressure keeps going down

Sorry for posting twice just trying to see if anyone has had this problem or knows why it is doing this.

my pressure was 52p @ idle and 43p @ wot so I changed my regulator spring to the longer blue one. Someone had done the bb mod so O took that out and put in the new spring and had the same pressure 52p and 43p so I put the bb back in with the new spring and was at 70p @ idle and 65p @ WOT just where I wanted it. Now every day it has come down a little at a time. The day after the mod it was at 68p @ idle the next day 65p @ idle and 58p @ WOT now today it is at 62-63p @ idle and 56-58p WOT WHAT GIVES!! I have no leaks. The fuel pump was replaced 2yr ago and also has a summit raceing pusher pump to give extra pressure and all works. Any help please. The only change is the weather has gotten colder.

04stroke · #2 (**permalink**) 12-15-2010, 03:41 AM

For me the cold weather makes my fuel pressure go up..I don't have the BBC mod or anything just a airdogII with my pressure set at 64 idle and 58 wot..but since this cold weather its 70-72 idle and 62-64 wot..don't have an answer for you but the cold deff has something to to do with it lol

**jimmyz32** · #3 (**permalink**) 12-15-2010, 04:28 AM

Well then that sux even more because mine is going down. It seems to have settled at 62p idle and 56-58p at WOT I want it back at 70p at idle. I may have to buy a external fuel regulator and set it my self.

04stroke · #4 (**permalink**) 12-15-2010, 04:52 AM

Well atleast its not dropping below 45.. and why do you want it at 70? I believe I've read it been told by a diesel tech that over 70 psi can blow the injector o rings? Don't know if its true or not tho

**jimmyz32** · #5 (**permalink**) 12-15-2010, 04:57 AM

yah anything above 70p cam blow injector o-rings. I just like to no It is the best it can get. Its just me

**SickStroke6.0** · #6 (**permalink**) 12-15-2010, 07:20 AM

Leave it where it is. That's perfect.

**jimmyz32** · #7 (**permalink**) 12-15-2010, 07:29 AM

I will leave it for now. I just could not figure out why it was dropping.

**SickStroke6.0** · #8 (**permalink**) 12-15-2010, 07:56 AM

If it drops anymore, I'd be concerned. But it shouldn't. It's probably just settling to where your fuel pump likes it best.

**jimmyz32** · #9 (**permalink**) 12-15-2010, 11:03 AM

I guess so . You would think it would be high with the new longer spring and a BB.

**Dave** · #10 (**permalink**) 12-15-2010, 11:50 AM

How cold is it where you are?

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