Posted by jdemaris on October 17, 2014 at 05:18:46 from (70.194.8.187):
In Reply to: Injector pump gurus posted by MSM on October 16, 2014 at 14:26:11:
Lack of fuel coming out the return does NOT have to mean something is plugged. It's possible the fuel-charging pump in the back many not be working. If not, no fuel from an outside source is going to work its way through.
I'd first pull the top cover off the pump and see if any fuel is coming of there.
If not (no fuel) - I'd pull the timing window off the side and make 100% sure the pump is actually turning and does not have a snapped driveshaft.
If that is all OK - I'd pull the low pressure fuel-pressure regulator and screen out of the inlet of the pump. Make sure the screen is clean and the piston and spring are working as they should.
If that looks OK, I'd pull the back cover off the low-pressure inlet/charge pump and see if the two pump vanes are not broken or stuck or worn out. Old ones are fiber and newer ones are steel.
Also note that the fuel shut-off solenoid has NO direct mechanical connection to the internal parts of the pump. Even if it has power and you hear it "click" . . the fuel still may be shut off. All the solenoid does is move out of the way of spring-loaded linkage and it's that linkage that turns the pump on. If it's stuck, it won't run regardless if the solenoid is working or not.
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