No idle

[Jbulach]

Don't just load the parts cannon, troubleshoot it. If there is a restriction, no hard part will fix it. Three check points will give you the 4 readings you need, restriction into the system, lift pump output pressure/FF inlet pressure, FF outlet pressure, (pressure drop across the filter)gallery pressure.

You should check for air also, air will give you low pressure readings as will high restriction. Too much restriction can actually cause air in the fuel in the form of LOTS of very tiny bubbles, it makes the fuel look cloudy in the clear line.View attachment 903535

Can you check for air after the overflow valve, or does it have to be before the IP?

 

[jefjoc]

View attachment 903574
I used a snubber that replaces the banjo bolt on the outlet of the filter housing. Cant remember where I got it, maybe TorkTek when I bought my adjustable overflow valve?

Good job, I ordered the gauge. Thank you .

 

[WillWagner]

Can you check for air after the overflow valve, or does it have to be before the IP?

No, after the overflow is just that, overflow. It is what pressure escapes, or is vented from the gallery, which is controlled by the overflow valve. The picture that was posted shows the one of two places to read the IP gallery/fuel filter out pressure.