Forced Induction Custom FI Setup Questions

Need help with fmu fuel line please

Old 12-18-2015, 09:42 AM
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Default Need help with fmu fuel line please

Hey guys,
I installed a basic bolt on turbo kit onto my b20 integra.
I'm running a 12:1 blox fmu at the moment. I do have a chipped ecu that I'll get tuned. But this is just a temporary solution and I don't beat the car long or hold it under boost for very long. I'm only running 5psi at the moment.
My question is I keep running into an issue with the fuel line that goes from my fpr to my fmu.
I installed a line I had that came with my adjustable fpr (not installed) which had a stamp for 3.4 bar. This started to weaken after a few drives and I noticed by some backfiring and fuel smell. So this was clearly leaking pressure.
I went to the auto parts store and picked up a line rated for 6.9bar (100psi or so I think)

And just now it started doing it again, the car starts running super rich and I can see the line being over flexed and such.

Stock fuel pressure is 35psi I believe.
I'm trying to do the math in my head and I can't seem to wrap my head around the calculation to determine the pressure it's holding when under 5psi.

In any event. What do I do about sourcing a line with enough pressure to hold this?
It'll be another month or so before I source my injectors and fuel pump and have the funds to throw it on a dyno. I just get worried about it running so damn rich. Thanks for the help guys. I searched and couldn't find much
Matthew121 is offline  
Old 12-18-2015, 12:27 PM
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Originally Posted by Matthew121 View Post
Hey guys,
I installed a basic bolt on turbo kit onto my b20 integra.
I'm running a 12:1 blox fmu at the moment. I do have a chipped ecu that I'll get tuned. But this is just a temporary solution and I don't beat the car long or hold it under boost for very long. I'm only running 5psi at the moment.
My question is I keep running into an issue with the fuel line that goes from my fpr to my fmu.
I installed a line I had that came with my adjustable fpr (not installed) which had a stamp for 3.4 bar. This started to weaken after a few drives and I noticed by some backfiring and fuel smell. So this was clearly leaking pressure.
I went to the auto parts store and picked up a line rated for 6.9bar (100psi or so I think)

And just now it started doing it again, the car starts running super rich and I can see the line being over flexed and such.

Stock fuel pressure is 35psi I believe.
I'm trying to do the math in my head and I can't seem to wrap my head around the calculation to determine the pressure it's holding when under 5psi.

In any event. What do I do about sourcing a line with enough pressure to hold this?
It'll be another month or so before I source my injectors and fuel pump and have the funds to throw it on a dyno. I just get worried about it running so damn rich. Thanks for the help guys. I searched and couldn't find much
Upon further research I don't think the hose is failing, I think what's happening is my plunger is sticking closed and I'm running the 12:1 fuel pressure at idle which explains why it's so rich so either I need a better vacuum source to pull the plunger up, or its dirty or something and needs cleaned?
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Old 12-21-2015, 10:00 AM
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Do you have a fuel pressure gauge on it? If not, I'd add one and see what's going on.
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Old 12-21-2015, 11:08 AM
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Originally Posted by Matt Cramer View Post
Do you have a fuel pressure gauge on it? If not, I'd add one and see what's going on.
I didn't. I have an adj fpr with one on it but I haven't installed it, I figured out it was definitely sticking closed. I pulled it apart, and it seems to be not happening as much except for a long 4th gear pull, when I shut the car off, and turn it back on it fixes it every time. But I just picked up some 450's and I'm getting a safc this week and I'm just gonna do the hack
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Old 12-28-2015, 12:07 PM
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That's your best bet. An fmu is not a tune. Your running 60 psi above your stock fuel pressure at 5 psi boost. That is damaging to your fuel system.
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