Rail pressure dropping to 2000psi

[paint94979]

Anyone have an idea what could cause this? Lift pump has been bypassed, fresh fuel, fuel filter doesn't have 2,000 miles on it? Balance rates are good BTW

 

[LBZrcks]

anyone have an idea what could cause this? lift pump has been bypassed, fresh fuel, fuel filter doesn't have 2,000 miles on it? Balance rates are good btw

lly.

 

[bullfrogjohnson]

big restriction pre cp3 or a failing injection pump. Install a guage at the filter head and check pressure

 

[PAT]

lly.

That's not nice Jason. Lol

 

[LBZrcks]

That's not nice Jason. Lol

:baby: Haha

 

[Burn Down]

Bottle test would be real easy... Not likely, but easy enough to check. Your running a race valve correct?

 

[paint94979]

Correct... It only does it under load?

 

[DIESELMAFIAPER.LB7]

I had a race valve do the same thing put the stock one in or a new race valve and check it again

 

[paint94979]

I've had this valve in for 4 years it was tightened in a vice lol its really tight

 

[bullfrogjohnson]

I've had this valve in for 4 years it was tightened in a vice lol its really tight

hook up a gauge. It wont lie to you. factory system should run -4 inHG of vacuum at idle. -8 to -12 inHG of vacuum at 160mpa. If it has way to much vacuum at 160mpa you have a restriction pre cp3. If it doesnt hold enough vacuum or no vaccum at all at 160mpa you have a weak cp3 or leak post cp3.

 

[paint94979]

hook up a gauge. It wont lie to you. factory system should run -4 inHG of vacuum at idle. -8 to -12 inHG of vacuum at 160mpa. If it has way to much vacuum at 160mpa you have a restriction pre cp3. If it doesnt hold enough vacuum or no vaccum at all at 160mpa you have a weak cp3 or leak post cp3.

thank you Travis

 

[TeaBagger2006]

Lly thang

 

[paint94979]

I bypassed my lift pump in the pouring ran so I did it quick and dirty... the 1/2 line might have a kink in it, maybe i'll check tomorrow

 

[gmduramax]

I bypassed my lift pump in the pouring ran so I did it quick and dirty... the 1/2 line might have a kink in it, maybe i'll check tomorrow

 

[emiller3]

Hopefully that's the only problem, its an easy fix.