Why is no one using a Fuel Pressure REGULATOR??

[Hohn]

I was just thinking about this today. As important as it is to have steady FP on our trucks (primarily 24V 98s and up), why is no one using a regulator??



I think it's bad to run up the FP more than necessary. The VP44 has a bypass that opens at 14psi. This tells me Bosch doesn't want more than 14psi at the pump.



I would think that a dynamic FP regulator (one that uses a BYPASS, not just a restriction) would be a good idea. This way, you all the fuel that's not needed to maintain 14psi is just returned to the tank.



You COULD argue that the VP's internal bypass does this, but it simply cannot flow enough. Otherwise, how could I get 17-18psi with the OEM LP?? It can't flow enough, so pressure exceeds 14psi even with the stock pump.



With this setup, you could have a rock-steady FP at whatever pressure you adjust the regulator to.



I'd bet that a regulated setup would cure MANY OEM lp issues, as the pump's internal bypass spring wouldn't constantly be cycling, and the LP wouldn't run as hot pumping fuel that isn't flowing.



Could a bypass regulator be the cure to the LP problem?



At the very least, it would allow a larger pump to be used without excessive FP.





You could probably even add a bypass-style FUEL filter to the return line, increasing fuel cleanliness and cooling the fuel in the bpass stream.



Justin

 

[R-N-R]

I use the Aeromotive bypass regulator set at 17psi in conjunction with a Carter 15psi pusher and a factory LP. Someday I will try and set it lower as long as I don't drop below 10psi at WOT.



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[caleb c.]

I use the one that came with my holley blue. I am also still using the stock lp. It's kinda nice to be able to set it wherever you want it.

 

[Texas Diesel]

Sol what you are suggesting is to use a lift pump that can flow more, at a greater pressure than 14PSI so that atleast 14PSI is available at all times? Sounds like a good idea, just need a higher flow/pressure pump and a bypass (shunt) regulator. I like it. My BRAND new lp is @ 10PSI WOT :-{} :{



Only caveat here is that the OEM lift pump delivers a lower pressure during cranking to aid starting I believe.



Where did you guys get the regulators?

 

[Hohn]

Summit and Jegs both carry the super-duper Aeromotive regulators. They are the best on the market, I hear.



jlh

 

[caleb c.]

I just used the one that came with my Holley pump. Nothing special,but it works good.

 

[rweis]

I put a Mallory 4307M on mine after the lp. Set at 12 psi. NOT MAINLY FOR THE VP. MAINLY to keep the flippen lp check valve ball seated so it does not get cocked in some weird direction and the fp go to zero. If you read the lp failure threads the check valve is a MAJOR failure point in the lp.



Also lets the lp run at a lower amperage (ie free'er) and at a nearly steady rpm (at least a small range) and with less stress to the lp.



I have a fuel filter comming right out of the tank and bypassing it back to the tank refilters the fuel in that loop constantly.



There is a thread on the DTT web site about their RASP and why they set the bypass at 12 - 14 psi ------ because BOSCH said so!!!!!!!!! because that is the ideal design parameter of the VP. Works for me!



I think a bypass regulator is a KEY to a properly fed VP and longivity of the lp.



Bob Weis