Can I use a fuel injection pressure tester from an auto parts store?

Guessing best to check after the FPR before the fuel rail?

 

yes just tee into the pressure line.
Try and not create a restriction use 5/16 size tee with the main line going straight and the 90 part to the gauge.

 

You say pressure line - would that be the fuel line right off the surge tank or the line right before going into the fuel rail?

 

Fuel pressure is anywhere from the pump too the fuel rail.Anything before the regulator is on the pressure side.The return line off the regulator will only have pressure on it if it has a restriction and could not return freely.The fuel goes from the pump to the rail and fills the rail from the bottom between the throttle bodies.

 

I hooked up the fuel injection pressure tester T'd off the line coming right off the barb from the OSP surge tank. The I.D. of the 'T' was 15/64" and fuel line I.D. was 5/16". My fuel pressure read 46psi turning the key (not starting sled). So, does that mean I need to install an AFPR or would reducing any restrictions in the return line lower my fuel pressure?

 

What was it running? Can you pull the boost line off yours and check it static when running?

 

I did not run the sled. This was key turned w/o starting. I could start the sled the way it's hooked up, but not sure how this gauge would work as it will likely only read the highest fuel pressure? Not sure the gauge would drop off w/o bleeding the fuel from the gauge to zero it out?

What boost line would I pull off?

 

It should read actual as you have fuel returning. Does the pressure drop on the gauge after you turn off the key or after the pump stops running? Mine won't hold pressure for long.

The boost line is down on the FPR on the left side of the plenum. It's a little grey line.