Hello,

anyone know if I can upgrade the rubber fuel return hose from my fuel lab FPR to the OEM hardline? I believe it’s causing fuel restrictions, as my idle pressure is 50-60 PSI. What would the hardline fitting size be?

 

Radium makes a fitting exactly for this use: http://www.radiumauto.com/M14-Invert...ings-P375.aspx

 

for this line that I circled?

The line that is circled, that’s the return line I want to upgrade.

 

Upgrading that from rail wouldn’t do anything. If you really need to upgrade your lines, you can upgrade your feed and the use your old feed oem hardline for return.

I can guarantee your problem is not with the return line itself.

What pump are you running?

 

450 walbro rewired. I’ve been running into fuel issues and my tuner suggested that my return line can’t handle it. I have ID2000, 450 walbro rewired, AEM e85 high flow rail, fuel lab FPR. Idle pressure is 50-60psi. It’s almost impossible to drive the car, hard to get out of first gear cause fuel is too lean, but idle it sits at 11-12afr. Not sure what else to do at this point.

 

Sounds like the tuner didn't tune the ID2000's correctly if it's idling at 11-12 AFR

So your 450 is wired to run at 100% all the time? There is your issue.

 

You need to make sure your pump is wired to still retain the factory high/low speed functionality. You also need to drill out the return line fittings on the fuel pump hanger. If you don't do that it will be the bottleneck regardless of what you do with the return lines. There are dedicated threads to both these subjects if you do a search.

 

thank you. Will try to find a thread

 

not sure if I am searching it right, but I can’t find any thread, could you be a help by chance? If I need to get my 450 to not run the whole time, I think it’ll solve some sort of issue. I will be going BPR fuel set up next year, but need to find an alternative until then.

 

@BamrynEvo Here, try these threads on the 450
http://https://www.evolutionm.net/fo...mp-rewire.html
http://https://www.evolutionm.net/fo...ion-table.html
https://www.evolutionm.net/forums/ev...e-circuit.html

 

and here is the thread about rewiring the fuel pump.

https://www.evolutionm.net/forums/ev...e-circuit.html