Fuel Pressure Regulation - JeepForum.com

 
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post #1 of 10 Old 05-11-2013, 10:29 PM Thread Starter
Neuner-9R
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Fuel Pressure Regulation

I have an electric fuel pump and getting ready to go pick up a Holley fuel pressure regulator to get it to the 3-3.5 range. Can the pressure from the pump be regulated with a resistor or potentiometer in line with the positive terminal instead?

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post #2 of 10 Old 05-12-2013, 06:31 AM
Moparmandjh
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How will that sense the fuel pressure as the demand changes?

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post #3 of 10 Old 05-12-2013, 08:09 AM
swatson454
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Weber? Here's a three-dollar regulator that works much better.


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post #4 of 10 Old 05-12-2013, 09:04 AM
cj5huntingrig
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No you cannot regulate the pump with resistance. You will burn it up or start a fire. I have the holley regulator and it works perfectly. You should buy an oil filled pressure gauge though. You can get a decent one from advance online for about $18. Contrary to popular advice on the forum, I had no luck with the bypass filter in the previous post even by following the exact directions posted. You also have the option of forgoing the regulator as long as you have the Holley red pump and change to a viton tipped needle and corresponding seat.
Tx. E

1974 CJ5 all stock except for Rocky Road SOA
Completely for hunting - not for show or rock climbing
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post #5 of 10 Old 05-12-2013, 09:47 AM Thread Starter
Neuner-9R
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Quote:
Originally Posted by cj5huntingrig
No you cannot regulate the pump with resistance. You will burn it up or start a fire.

I had no luck with the bypass filter in the previous post even by following the exact directions posted.
Tx. E
Thanks for the info.

Yeah, I tried that filter as well and it didn't work for me either. Glad to hear I'm not the only one. If it didn't cost more to ship than what it's worth, I give it to somebody.
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post #6 of 10 Old 05-12-2013, 09:54 AM
swatson454
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What pump are you guys running? I find your results interesting. The viton-tipped needle is stellar advice.


Shawn

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post #7 of 10 Old 05-12-2013, 12:10 PM
cj5huntingrig
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Holley Red

1974 CJ5 all stock except for Rocky Road SOA
Completely for hunting - not for show or rock climbing
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post #8 of 10 Old 05-12-2013, 01:32 PM Thread Starter
Neuner-9R
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Quote:
Originally Posted by swatson454
What pump are you guys running?

Shawn
From PO. Can't find name or model.
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post #9 of 10 Old 05-18-2013, 05:50 PM Thread Starter
Neuner-9R
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Quote:
Originally Posted by Neuner-9R

Thanks for the info.

Yeah, I tried that filter as well and it didn't work for me either. Glad to hear I'm not the only one. If it didn't cost more to ship than what it's worth, I give it to somebody.
From what I've seen in research, the bypass filter regulates the pressure to 5psi however the weber likes 3-3.5 which may be why I didn't notice the difference. My pump puts out 7 psi. Just got the Holley regulator installed, set it to 3.5 and took it for a spin. Definitely an improvement!
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post #10 of 10 Old 05-24-2013, 08:03 AM Thread Starter
Neuner-9R
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Update: Before the regulator I was averaging around 15mpg but afterwards, with the same driving conditions, I'm now averaging 17mpg.

Never saw the improvement with the bypass filter.
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