Max fuel pressure

[dvernst]

When I pinch the return line the fuel pressure goes up to about 80-85. Does this sound about right? Thanks

 

[Chuck Leeper]

That depends..

When I pinch the return line the fuel pressure goes up to about 80-85. Does this sound about right? Thanks

on the pump you have.
A bit more info would be good.:biggrin:

 

[dvernst]

I believe its a Walbro 307. I'm running lean (680-700 o2)at wot no matter what I do. I have a TT chip, and I turned the injector duty cycle all the way up , and still have the same low o2 reading.

 

[Sweet6]

I thought the 307 maxxed out at 70 PSI.