I got some hose pinchers to test for leaky injectors, but I'm a complete newb at fuel systems, and I'm tired of searching.

Which lines (and where are they located) do I pinch off? I have an SX FPR, and it has three fuel lines coming out. The one coming out the bottom looks like it goes to the fuel pressure gauge sensor unit, but I'm not sure about the two on the sides. I know the one that goes back to the tank will be pinched off, but I don't know which one that is, or the location of the line coming from the tank.

Blake

 

The easiest is just to buy a fuel pressure guage tester (30 bucks max) and put it inline with the sending line. Then all you have to do is watch to see that the pressure doesn't drop till after x min (fsm states duration).........

but you just pinch the return line and look to see if they leak. If you're unsure of witch one just pinch them all off.

the FSM show how to calcutlate the flow rate of the injectors (stop watch/measure) if you want to do that also.......

 

You need to pinch the feed after it's pressurized; with the pump shut down the pressure will often bleed off back through the pump depending on which way the stator stops (at least with my walboro pump, that's the case).

To be sure, when testing for leaks, I remove the rails with the injectors in them and the lines hooked up and pressurize and LOOK for leaks

 

don't try that with top feed

The stock systems holds pressure after it's off.

walboro's hold pressure too from what i've experienced (two in FC's)

 

So I should just be able to pinch off the return line?

I can't pinch them all off, cause one goes to the in cabin fuel pressure gauge, and it'd be retarded to spend $30 on something I don't need.

Which line is the sending line?

 

If the SX works like the Aeromotive regulator I have, it doesn't hold pressure for 20 minutes like the stock one will. This won't be a good indication.