xms

Okay guys I got a question on lp pressure, I just installed a new carter pump with holley blue and regulator now the pressure is 20 psi on idle, driving normal driving it drops down to 18, but when I change to level 5 on the attitude it gets as low 13 psi, is 20 to much on idle cause I don't want to hurt my vp44 that has just been replaced,I can turn it down the pressure if I have two with regulator.

dieselfan

i think thats perfect, 10psi minimum. your vp will like the good circulation for cooling i think. dieselfan

blackdiesel

thats great. mine is upwards of 25 psi or so. (dont have the 30 psi guage, so im not positive)

anything above 28 (i think) is where seals start leaking and you get hard starts

keithw1975

How in the world are you getting that much pressure out of a Carter lift pump? I use a mechanical boost gauge to measure mine and they vary between 12 and 14 psi idle.

Keith

P.J

.....That's how.

keithw1975

I googled Holley Blue and it says it has a maximum pressure of 14 PSI though.

Keith

xms

When you use a holly blue as a helper in line with a carter pump you can get 20-25 depending on how much you regulate it.

yamroamer

I run 27/29 psi @ idle, have a BD pusher pump fitted.

xms

How long have you been running this setup 27/29 is this to much for the vp44

Tiger Rag

I ran that same system for a good while with no issues. Fuel pressure was about the same. I'm going to sell it soon because I pulled it off when I put a cam in.....added the 12 valve lift pump then. I won't have to worry about another lift pump for another 250,000+ miles now.

Ph4tty

What kind of fp do you get TR?

JDGnut

When you put the two pumps in series, you basically add the pressures together.. if each build 10psi.. you end up with 20... Where is your regulator.. bases on your pressures.. it must be have the holley, but before the LP... Try moving the regulator to after the LP... Which Carter pump are you running??
Bryan

Tiger Rag

I got 28 with the BD pusher pump system. Now I get 40 at idle with the 12 valve pump. It varies with rpm of course since it runs off the cam. I can drop it down to 26-28 at wot.

yamroamer

Hi xms

Been running with a BD pusher pump since early this year,done about 7000 miles since then.I queried the idle pressure with BDs but they said that 29 psi was normal for their pusher pump kit,and that only if the fuel pressure exceeded 40 psi would there be problems.The pump that comes with the kit is a Carter p4601

JDGnut

I"m gald they are having better luck with the 4601.. I had one that only lasted a week.. Dad's lasted just a few hrs... This was the black hp pump..
Bryan