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355 Fuel Pressure Regulator

Discussion in '348/355' started by SethP, Jul 4, 2017.

  1. taz355

    taz355 F1 Veteran
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    Still waiting for the brotherhood to find me a fuel rail adapter that fits to our stock rails and has an -6an or -4an fitting
    We also need an adapter for our fuel lines that goes to 3/8 npt so it can screw directly into the fuel pressure regulator
     
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  3. m.stojanovic

    m.stojanovic Formula 3
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  4. taz355

    taz355 F1 Veteran
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    Do you have a pic of it as ours has an print that pushes into the rail and a metric reverse taper coming out.
    I believe it’s 12mmx1.5 but a reverse taper that a male jic or something similar would couple with.
     
  5. taz355

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    This is what it looks like the nipple with the orang goes into the fuel rail
    The male oem fuel lines taper fits on the threaded portion and a outside cooler pulls them together
     
  6. taz355

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    The rail adapters I find have only 1/8 inch return fitting and the hole for fuel is likely too small for a proper bypass back to tank.
    I think we need at least -2an or even -3an or 1/4 inch npt

    The first diagram fits but the nipple is slightly small but would likely fit with a larger oring
     
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  8. SoCal1

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    I'm damned if I remember. I believe there is an acura adapter that fits. I had a couple laying around and cant find them in my AN fitting box. May have put them on my 348 TB setup
     
  9. taz355

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    Does your 348 use 355 fuel rails because I did not think they were the same
     
  10. m.stojanovic

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  11. taz355

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    Hi Miro
    Yes I have a few I can change as well on a lathe but I was looking for 1 I did not have to
     
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  13. taz355

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    Mine is 10.89mm on nipple end before oring and 13.37 below oring and 14.4 on oring once installed.
     
  14. m.stojanovic

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    Yes that's about right for Bosch FPRs. I suggest you go ahead with the mod of the 5/8 nipple adapters that you have as it seems that nobody is making adapters for Bosch FPR rail sockets, except VAC motorsport but their adapter is for early style Bosch FPRs (https://store.vacmotorsports.com/vac-performance-fuel-pressure-regulator-adaptor-early-style-bosch-p1765.aspx).

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  15. taz355

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    The problem I see with mine Miro is I do not like the small 1/8 inch out feed because it could be too small for the flow
    As you can see the hole is quite a bit larger in the oem and because it’s steel the thin wall where the oring sits is likely fine
    But on this aluminum one I feel if I machine it down the wall thickness would likely be too thin
     
  16. taz355

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    I am starting to think it would be easier just to cut out the adapter from the stock fpr and weld a -an3 on it
     
  17. taz355

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    I just took a picture of the outlet side duh
    Looks like the outlet side is a lot smaller on the factory piece so maybe I can modify
    Without restricting too much
     
  18. m.stojanovic

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    A smaller orifice will not really impede the overall flow, the fuel will just flow faster through it. No big deal if the length of the reduced diameter is short, very small friction losses. A flow through a longer stretch with a reduced diameter would cause impediment. As it is just the return flow, you should have no problem like higher fuel pressure at idle.
     
  19. SoCal1

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    No I have a 355 TB setup ready for a 348 :)
     
  20. taz355

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    Gotcha
    So I machined the oring groove and maybe it will fit
    I will let the brotherhood know
     
  21. taz355

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    Question for the brotherhood
    I far prefer the factory jic style fuel fittings but it seems that most of the aftermarket fuel pressure regulators side towards using npt instead.
    I do not trust npt verses jic as much.
    What does everyone else think?
     
  22. 308 GTB

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    Aeromotive 13101 EFI Regulator, A1000 Injected Bypass - Adjustable and JEGS fuel, pressure gauge.
     
  23. SoCal1

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    You ever check your actual AFR on each bank of the motor with a wide band? I get a little variance side to side I adjust with fuel pressure
     
  24. SoCal1

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    I cant remember but I believe an Acura one fits, I had a couple but damned if I can remember
     
  25. 308 GTB

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    Tim,

    I was able to do that with my old set-up (posts 14 and 15). But those Aeromotive FPRs were old and rather than replacing them, I upgraded to a single heavy-duty regulator and was able to use some of the existing plumbing and a single fuel pressure gauge. My car runs better with this new set-up. Testing was done last year at Daytona, Watkins Glen and Lime Rock Park.

    When my car gets back from Florida in April, we'll tune and dyno the car again. The last time that was done was in 2013. Since then, in addition to this new set-up, I've installed Tubi exhaust manifolds and have had the fuel injectors serviced.

    Barry
     
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  26. 308 GTB

    308 GTB F1 World Champ
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    Right, Grant. New fuel lines were installed years ago when the two Aeromotive FPRs replaced the OEM Factory regulators. When we changed to the single heavy-duty regulator, those new fuel lines were used to replumb my set-up.

    Barry
     
  27. taz355

    taz355 F1 Veteran
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    Thanks Barry
    I really wanted to stay with factory but may have to make a custom fitting.
    Was hoping someone would have a source for an off the shelf adapter
     
  28. PaulK

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    Hi Everyone,

    Has anyone had any experience with SPA and their fuel pressure regulator? They say its a drop in replacement.

    https://spaturbousa.com/products/ferrari-355-456-550-512-in-rail-adjustable-fuel-pressure-regulator-e85-safe?_pos=1&_sid=d86253f86&_ss=r

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    fits to Ferrari 355 456 550 & 512
    direct replaces OEM regulators in the factory EFI systems
    floating ball seal
    adjustable 10 to 65 psi range
    1:1 boost reference.
    E85, 100% Ethanol and methanol safe.
    can be used as OEM replacement

    replace the following OE PN:
    0280 160 564
     
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