Qboneus said: (quoted from post at 22:56:29 06/14/08) ....I'm sure my gas fuel press guages would explode IF I tried to attach them to this fuel rail.
So HOW do I know?
....
tal
Fuel injector opening pressure is 3600 to 3750 PSI new. Used injectors, 2900 PSI minimum. When I go through a set of those injectors I set them to 3600 PSI.
Unless the fuel injection pump has been replaced, it should be an American Bosch Model 100 pump. Those pumps use a sleeve type metering valve that if stuck would have to have done major damage to the pump. The valve slides up and down on the distributer shaft that rotates inside the valve and also functions as the high pressure pump. Also if it is stuck and cannot move up and down it will damage the control lever as you open the throttle.
The amount of fuel returned to the tank is much greater than is sent through the injectors. You should have gravity feed to the primary filter and then a line to the back of the pump where the transfer or charge pump is located. On the back of the pump is the hand primer pump. Loosen the bail and swing it out of the way and then stroke to knob in and out to pump the fuel back to the secondary filter and then back to the injection pump. If it is quite when you are pumping the fuel you should be able to hear it return to the tank
The elbow on the engine side of pump where the return line connects to has an orifice to restrict the amount of fuel returned to the tank. Unlike a Roosa Master pump which will not function with a plugged return line, the American Bosch pump uses a pressurized pump housing.
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