Quote:
Originally Posted by Dirtshooter7
No there is nothing blocking fuel from going anywhere. That’s the issue. The fuel enters the filter and disperses. It doesn’t go back up the injector or overflow return lines for obvious reasons. It does enter the low pressure side of the injection pump.
The issue is that the primer cannot build enough pressure to force the fuel through the high pressure side of the pump because the fuel just leaves through the tank return line unobstructed.
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I have not notice which engines fuel injection pump you are speaking but there is a fuel supply system that is what you are priming with the hand primer and on my year and model when the engine is idling you get about 8 psi and at 3000 rpm you get about 18 psi of pf pressure held in side of the Fuel Injection Pump Housing.
That supplies the Elements/Plungers and Barrels with fuel and it is those Elements that supply the high pressure fuel to the Injectors. You cannot prime with the hand primer though the Elements up to the Injector because each Element has a Delivery Valve (one way valve) between the Injector and the Element. I believe the spring on the delivery valve is stronger then your hand primer can cause to compress.
So you have a fuel supply system and a high pressure fuel system (the one that injects the fuel).