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Old 03-03-2017, 10:39 AM
v8volvo v8volvo is offline
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Join Date: Jun 2009
Location: Montana, USA
Vehicle: '86 745, '83 764
Posts: 1,618
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Agree ^

If the car was parked with the IP unions open, while you had the injectors out, and the level in the tank was low, it will siphon all the fuel out of the pump and empty out the supply circuit. Once the supply pump in the IP is dry, it is much harder for it to pull fuel and reprime. Positive pressure on the fuel inlet is the best way to do this. Once there is fuel in the suction pump (assuming it didn't have an issue as ngoma mentioned, but probably OK if it worked fine before), it'll prime the rest of it, and the lines, quickly.

Any of the options described will do well for this. Electric booster pump is nice since it maintains steady pressure but a primer bulb is fine if you can run the starter under the hood from a jumper, or have a helper work the bulb while you turn the key to prime. Gravity feed would probably work well but might be slower.

Failure of the shutoff solenoid wouldn't prevent the IP from priming itself and circulating fuel from the tank, it only blocks the port that allows the high-pressure chamber in the pump head from filling with fuel from the main pump housing. It would prevent you from bleeding the hard lines if it stuck but the pump would pull fuel from the filter just fine. Solenoid failure is rare, probably just needs a little help to prime the suction pump then it'll go.

I like to unplug the ground terminal from the GP relay for extended cranking to bleed to save some wear on the plugs and give some extra current for the starter as well, the plugs pull amps that reduce speed. Crank till there is fuel flowing from all 6, tighten the nuts, put the ground back on the relay, and it should start right up.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k

Last edited by v8volvo; 03-03-2017 at 10:42 AM.
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