Fuel pressure regulator
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Senior User
Joined: Feb 2009
Posts: 372
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From: Westfield, MA
Fuel pressure regulator
I am almost ready to pull the mechanical fuel pump and hook in the electric one when I came across the idea of having a fuel pressure regulator. Is this something that is needed or is it something to just take more of my hard earned money. I found one on ebay for about $20 plus shipping that is adjustable, even found one that has a small guage on it so you can adjust the pressure without hooking in a test guage for about the same price. Non of them were for diesel fuel so I don't know if diesel will hurt them or not, not sure what is inside them for seals. What pressure should it be set at?
Lead Driver
Joined: Dec 2006
Posts: 6,496
Likes: 94
From: So. Jersey
If you go with one of these pumps from AdvanceAuto
ELEC FUEL PUMP DIESEL by Mr. Gasket - Part 12D - Advance Auto Parts
no regulator necessary. I kinda like the prefilter included. These pumps are usually low amp draw and quiet.
If you go with a Holley red or blue, I'd run the available regulator.
Pressure below. Follow for 7.3l
ELEC FUEL PUMP DIESEL by Mr. Gasket - Part 12D - Advance Auto Parts
no regulator necessary. I kinda like the prefilter included. These pumps are usually low amp draw and quiet.
If you go with a Holley red or blue, I'd run the available regulator.
Pressure below. Follow for 7.3l
Thread Starter
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Senior User
Joined: Feb 2009
Posts: 372
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From: Westfield, MA
I have a Carter pump, I think it is set at 9 or 10 psi. Looks like that is high. Getting a regulator isn't a problem, it just delays my install for another week. I have been slowly adding pieces. I have the pump mounted, fuse block, relay and most of the wiring done. Need to mount filter and now I guess a regulator. When all is mounted and wired I'll remove the mechanical pump and hook in the fuel lines.
Post Fiend
Joined: Oct 2007
Posts: 10,501
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From: Faibanks Ak.
You still want 4 to 6 Pounds at the pump and it is sticking in my mind that you don't want it to be over 8 pounds. The test port tells you what you have at the pump.
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
If you are talking the test port on the IP, that is after it goes through the IP pump to supply internal IP pressure.
Fuel pressure at the filter should not go over 8 PSI.
Normal with the mechanical pump is around 7 PSI usually at idle.
Fuel pressure at the filter should not go over 8 PSI.
Normal with the mechanical pump is around 7 PSI usually at idle.
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Post Fiend
Joined: Oct 2007
Posts: 10,501
Likes: 5
From: Faibanks Ak.
I.m talking testing at the schrader valve, it seems to me that you don't want over 8 pounds to the IP. I don't know what kind of pressure the IP puts out but am sure that none of my guages will measure it.
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Thread Starter
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Senior User
Joined: Feb 2009
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From: Westfield, MA
The chart says 2 pounds per square inch or .14 kg per square cm. those two values are equal, they are the same pressure, one is ASE and one is metric. Unless that is the wrong chart, which I don't think it is, the max pressure at the filter should be 2 psi. Look at the top of the chart it says psi (kg/cm2) . The two under psi in that column means 2 psi or .14kg/cm2. Not sure where you guys are coming up with 4 to 6 psi. Can you show me a chart that says that. Not claiming to be an expert but that chart says 2 psi at the filter inlet. 1 psi at the filter outlet, pressure drop caused by the fuel flowing through the filter.
Look at the bottom of the chart the (1) stands for pressure at idle and the (2) stands for pressure at 3300 rpms.
Look at the bottom of the chart the (1) stands for pressure at idle and the (2) stands for pressure at 3300 rpms.