So I'm going through fuel pressure tests to trouble shoot a high rpm hesitation - and I'm kinda sick getting 12 mpg.

75 psi with the pump deadheaded - great. Splice in a tee connector and I get 75 psi at idle - not so great.

I didn't exactly want to rule out the pressure regulator right away, pulled the return line off and I can easily blow through it. What got me was that the line was dry when I pulled it off - I can jumper out the fuel pump and run it for minutes and nothing ever comes out of it

So - is my problem with the regulator or is it the mother of all clogs?

 

Is the fuel plumbed to flowing through the rail in the correct direction?

 

Hmmm, Well I never changed it, but I've had to make pick up plenty of slack from a sloppy engine change.

Right now the fuel input is connected to the hose up front, with the return behind it.

 

I've seen this before on certain cars. The pressure regulator was clogged with rust.

 

Looks like that was my problem - changed the regulator and had my injectors cleaned & refurbed at a local drag racing shop and I'm up to 22 mpg now.

Which means the 7 gets about the same mileage as my daily driver...