Fuel pressure at idle is 80psi on 420a??

[jj80]

So I put a turbo on a stock 420a in a 97 Eclipse. I installed a 12:1 fmu with a 255lph walbro pump and I'm running 8psi. Everything was working great for almost two weeks when I realized that I was starting to run rich. The AEM WB would read 10:1AFR and then at times it would just blink to indicate richer that 10:1. I didn't check this previously because the car has been running great but after my rich issue I checked my fuel pressure. It was 80-90psi at idle. Probably why I'm running rich. My question is why would this happen after almost two weeks? I removed the FMU and put everything to stock and still the same thing with the fuel pressure. I pulled the fpr and used compressed air. it started bypassing at 53psi. This seemed a little high??? no kinks in fuel lines. Has anyone had an issue like this before?

 

[jj80]

I wanted to mention that this is a side project car that has nothing to do with my 1g that is my profile car.

 

[techghost]

do you have a Fuel pressure gauge in the fuel line to check the pressure? i assume yes.

Check the return line to see if its clogged/blocked or not. i would remove return line and put a bucket or something and then start the car to see petrol coming out of it and observe fuel pressure.

Hope this helps

 

[kergilman]

do you have a Fuel pressure gauge in the fuel line to check the pressure? i assume yes.

Check the return line to see if its clogged/blocked or not. i would remove return line and put a bucket or something and then start the car to see petrol coming out of it and observe fuel pressure.

Hope this helps

+1 Sounds like a blocked return line.

 

[Dallas J]

Holy crap 12:1.. At 8psi thats almost 140psi.

Sounds like it will kill them injectors pretty quick. Also, at that pressure im sure youre way past the choke point where increasing pressure does pretty much nothing.