Am testing fuel pressure on my S. Due to easy access of the rubber return fuel line at the FPR I am using this. Would the fuel pressure be a useable number after the FPR on the return line? I am getting a reading of 12psi which is drastically low and would provide reasoning behing my intermittent stalling and hard starting...

I assume this pressure is lower being down stream in the system... However how much lower would this be..

..Kyle

 

After rereading my post i realize, this isn't a very bright question.. I am going to try testing on the supply line..

 

You want to measure before the FPR, not after.

 

Realising my mistake while thinking about it last night I am now sitting in the office trying to think of an easily accessible fuel supply line prior to the rail. Is there a rubber fuel line that is close?

Anyone have a picture of their bay around that area or a decent diagram?

 

The pump is easy to get at.

 

Don't most fuel rails have a schraeder valve where you can attach the fuel pressure gauge?

I'll have to check on my S when I get home.

 

The S doesn't have a Shraeder valve..

 

According to the helms, you need to remove the fuel pulsation damper on the fuel rail (looks like a big knob thingy) and attach the pressure gauge there. fuel pressure should be between 47 and 54 psi.

 

I drilled a hole on the end of my fuel rail. I tapped 1/4" NPT liquid filled pressure gauge, search for Sidway's install tread.

 

The OEM tool replaces the fuel damper, and a pressure gauge attaches to it.