If both of the hoses to the fuel rail are disconnected, should you be able to blow through the inlet hose and have air come out of the return with no restriction? If so, mine is completely plugged.

 

Where is the fuel regulator located? That could be one source of the 'plug' the other may be a check-valve somewhere in the line...

I am not really familar with the FI rotaries yet, but those might be two possibilites. Anyone else with more experience in this departmet have anything to say?

 

Well, the regulator only bumps the pressure between 40-ish and 60-ish psi. Basically, it regulates the pressure down at idle because the high-flow injectors have pretty shitty resolution, so idle mixture can be tough otherwise. I don't think there's any restriction, as it just passes across the rat's nest, rubber hose to the rail, through the rail, and back through the rat's nest.

Are you trying to start a barn find, or is this a daily that's quit on you? If you're trying to start an engine that's sat long enough for the volatiles to evaporate out of the fuel lines, you should seriously consider pulling the manifold, replacing your fuel line, and sending the injectors off to be cleaned.

 

No. If the holes for the injectors are plugged..and you blow in the inlet, nothing should come out the outlet..unless your lungs can generate 37 psi.

It sounds like you have a sticking regulator if you can blow through it. I am currently having the same problem. The reg is only like 2 years old..it somewhat regulates pressure, but you can see the fuel pressure drop to 0 once the pump is off (using fuel pressure tester). Every once in awhile, it will hold the pressure (32-35 psi)..other times it will stick partially open and allow pressure to drop to 0.

 

The car had been sitting for 7 or so years with fuel in the tank. I have had to clean out all the lines under the car, the fuel pump inlet and screen. The return leg of the fuel pickup was completely clogged. I have come to the conclusion that i will have to pull the manifold and clean the fuel rail and injectors although i was hoping to avoid it. The tank is going to be the fun part.

 

Oh yeah, dude. You know you're working with rubber cement in the lines - just take them all off and clean. Send the injectors off to www.witchhunter.com. Good work, cheap price. I've sent fully seized injectors and gotten them back at OEM flow, within 4cc/min (less than 1/2%) for the standard price. If you include your o-rings and grommets, they'll even come back to you with new rubbers.