How much fuel pressure is too much?
Registered User
Joined: Apr 2003
Posts: 6,564
Likes: 6
From: Cummins Technical Center, IN
The flow rating is fine, but the pressure will blow the diaphragm on the inlet to the VP44. I recall reading that 20psi is the max inlet pressure for a VP44.
zulu,
Can you explain how placing your fuel pressure gauge before the filter aids you in monitoring filter life? I think you have your lines seriously crossed.
zulu,
Can you explain how placing your fuel pressure gauge before the filter aids you in monitoring filter life? I think you have your lines seriously crossed.
IIRC, max hp came at 28psi or so, but I could be wrong. It was in an old Don M post.
jh
Registered User
Joined: Nov 2006
Posts: 1,491
Likes: 3
From: Longmont, CO
A 150 GPH pump rated to 50 psi will either:
a) stall, because it will not be able to push 150 GPH through the fuel system, or
b) build up more pressure than 50 psi and damage the IP.
A bypass is necessary if a pump of this capacity is used.
Bosch VP44, 14 psi ball valve on the drain line has nothing to do with pressure regulation. It is a check valve, not a pressure relief valve, according to FSM
I had a writeup a while ago about the flows you get through the stock fuel system: https://www.dieseltruckresource.com/...d.php?t=138789
-P
a) stall, because it will not be able to push 150 GPH through the fuel system, or
b) build up more pressure than 50 psi and damage the IP.
A bypass is necessary if a pump of this capacity is used.
Bosch VP44, 14 psi ball valve on the drain line has nothing to do with pressure regulation. It is a check valve, not a pressure relief valve, according to FSM
I had a writeup a while ago about the flows you get through the stock fuel system: https://www.dieseltruckresource.com/...d.php?t=138789
-P
Registered User
Joined: Jan 2005
Posts: 356
Likes: 1
From: Cynthiana, Kentucky
How would say a Carter 4601HP pump or Holley Black pump run if bypassing the stock lift pump altogether? I have thought about doing this with my Carter but am not sure it will support the fuel demands by itself. I just don't like the idea of more than one pump, myself.
Thanks,
Rodney
Thanks,
Rodney
Registered User
Joined: Nov 2006
Posts: 1,491
Likes: 3
From: Longmont, CO
I have read threads where people have done this. Some had good success, others said the pressures weren't good. Someone also ran the two in parallel, and they got very stable idle / WOT pressures just at about perfect value (17 psi IIRC).
-P
-P
Registered User
Joined: Aug 2005
Posts: 3,465
Likes: 0
From: fredericksburg, virginia
How would say a Carter 4601HP pump or Holley Black pump run if bypassing the stock lift pump altogether? I have thought about doing this with my Carter but am not sure it will support the fuel demands by itself. I just don't like the idea of more than one pump, myself.
Thanks,
Rodney
Thanks,
Rodney
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