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Old November 7th, 2011, 12:12 AM   #1
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Fuel Pressure Regulator

Im going to buy my injectors next week. I was wondering if our 7gen v6 cars use fuel pressure regulator. I heard it is in our fuel tank. Im boosted, so my question is do i need an after market fuel pressure regulator? If not how do i control my fuel pressure?


HERE IS A YOUTUBE LINK OF MY CAR. JUST A QUICK VID OF THE SPOOL NOTHING BIG. Thanks

http://youtu.be/02B7nX8cYJA
Not sure if this link works. If not just go on youtube and type in "MMP Accord Getting Ready" it should come up.

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Old November 8th, 2011, 02:03 AM   #2
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Or if anyone knows if the FMU's work?

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Old November 8th, 2011, 10:45 AM   #3
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you would need custom fuel rail with a return line to the fuel tank to run a FPR.
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Old November 8th, 2011, 12:13 PM   #4
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pics of boost?
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Old November 8th, 2011, 01:12 PM   #5
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pics of boost?
x2
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Old November 8th, 2011, 01:45 PM   #6
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you would need custom fuel rail with a return line to the fuel tank to run a FPR.
I have been reading about a return line. Why is it that i need one?

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Old November 8th, 2011, 01:45 PM   #7
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Pics up soon.

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Old November 8th, 2011, 02:52 PM   #8
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becuase you can't run an inline FPR if there is no return system to regulate from. Our vehicles are equipped with a fuel system that has no return.
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Old November 8th, 2011, 03:07 PM   #9
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becuase you can't run an inline FPR if there is no return system to regulate from. Our vehicles are equipped with a fuel system that has no return.
Dang that sucks. Do you know where i can get a link of how to do this?

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Old November 8th, 2011, 03:08 PM   #10
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So any one that is going to boost does this for more fuel?

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Old November 8th, 2011, 03:49 PM   #11
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it depends on how many lbs you boost. If you pass the threshold, yes you will need bigger fuel pump, return system, etc.
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Old November 8th, 2011, 04:49 PM   #12
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it depends on how many lbs you boost. If you pass the threshold, yes you will need bigger fuel pump, return system, etc.
Right now without tune im at 5psi but i want to boost 7psi when i tune. Would i need a return with 7psi because next friday when i get paid i want to finish up and dyno tune. I just want to make sure i have the right fuel system. Its my DD and i just want a street tune not track. I dont think our stock j30a4 injectors can handle 7psi right? or can they handle 5psi?

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Old November 8th, 2011, 04:58 PM   #13
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Link is up on 1st post. Just a Quick vid of spool sound.

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Old November 8th, 2011, 07:20 PM   #14
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I dont think our stock j30a4 injectors can handle 7psi right? or can they handle 5psi?
Pretty sure the stock injectors (240cc flow) will handle 5psi. You'd probably need the rsx-s injector upgrade to do much more than that, though I'm no expert just a novice (just starting..).

Check out Paul's Fuel Injector Upgrades thread too.
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Old November 8th, 2011, 07:44 PM   #15
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Pretty sure the stock injectors (240cc flow) will handle 5psi. You'd probably need the rsx-s injector upgrade to do much more than that, though I'm no expert just a novice (just starting..).

Check out Paul's Fuel Injector Upgrades thread too.
Thanks man. That helped alot.

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Old November 9th, 2011, 07:42 PM   #16
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Sounds nice bro. I hope to see more picks and vids soon :d congrats on going boost bro. Enjoy and be safe!!!
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Old November 9th, 2011, 08:41 PM   #17
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Sounds nice bro. I hope to see more picks and vids soon :d congrats on going boost bro. Enjoy and be safe!!!
Thanks. I will post more as soon as i hit the dyno to get tuned. Which all im waiting for is injectors and next friday for pay day

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Old November 20th, 2011, 12:04 PM   #18
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i dont have any issues with me fpr. and i have not installed a return for it.i simple removed the fpr in the tank and added my aftermarket fpr to the line in the engine bay. no issues thus far been like that for a year now. ever since i was running nitrous..
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Old November 20th, 2011, 12:07 PM   #19
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emtdiaz, how does the car respond and act with 5lbs? and wut trim turbo u running? just wondering
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Old April 10th, 2012, 03:37 AM   #20
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i dont have any issues with me fpr. and i have not installed a return for it.i simple removed the fpr in the tank and added my aftermarket fpr to the line in the engine bay. no issues thus far been like that for a year now. ever since i was running nitrous..
Ok so lets get this straight in my pea sized brain... you do not have a return line? So your system goes tank-pump-regulator-rail-injectors?
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Old April 10th, 2012, 03:25 PM   #21
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ya.removed the fpr in the tank.installed a walbro 255 and installed my pfr in line in the engine bay. no return. it runs stock fuel pressure, right now.b.c i dont have my car tunned for my recent turbo build but ya. works fine..
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Old April 12th, 2012, 07:03 PM   #22
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ya.removed the fpr in the tank.installed a walbro 255 and installed my pfr in line in the engine bay. no return. it runs stock fuel pressure, right now.b.c i dont have my car tunned for my recent turbo build but ya. works fine..
Did you use a universal 255 fuel pump or a specific one?

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Old April 13th, 2012, 09:12 AM   #23
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mybuddy had one and i for get what it was for. but i was able to ake it fit with some slight mods. i have a extra sending unit to play with so i wasnt out anything if i messed it up
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Old April 13th, 2012, 09:40 AM   #24
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ya.removed the fpr in the tank.installed a walbro 255 and installed my pfr in line in the engine bay. no return. it runs stock fuel pressure, right now.b.c i dont have my car tunned for my recent turbo build but ya. works fine..

here's the problem with your setup.

You put the regulator before it enters the fuel rail. So the reading you got is before the fuel rail. the problem is, you're now regulating fuel to the fuel rail which is bad for a fuel hungry engine i.e boost high comp, larger injectors etc.

A fuel system with a return line regulates fuel after the fuel rail, so it regulates after the feed to the engine. This ensures that the amount of Fuel Pressure to the injectors are the same.

The problem with our systems which everyone has experience with boost at high RPM is that fuel is the FPR is at the fuel pump. At high RPM everyone leans out because the pressure is not adequate to supply the injectors.
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Old April 14th, 2012, 06:39 PM   #25
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Sounds like a good explanation. Glad I haven't tuned on my turbo setup. Well this will make me find or have return fuel rails and switch to a fuel cell, with a lot let parts then factory. Thanks for the info
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Old April 17th, 2012, 08:46 PM   #26
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Pretty sure the stock injectors (240cc flow) will handle 5psi. You'd probably need the rsx-s injector upgrade to do much more than that, though I'm no expert just a novice (just starting..).

Check out Paul's Fuel Injector Upgrades thread too.
How are you doing guys/gals, Im new on V6 performance and not an expert on cars but willing to learn and invest

So both, the RSX-S or RDX injectors will work on my completely stock V6 engine with Auto trany? If on a future I decide to go S/C, which injector should I pick right now (RDX or RSX-S) so I can be ready for the upgrade?
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