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Old 04-14-2015, 03:46 PM
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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Yeah, that still is sounding like severe fuel restriction and/or aerated fuel.

As noted above, using a low-pressure electric lift pump can identify whether it's an issue with air ingress on the supply side, as long as there's not a restriction or air leak upstream of the filter. If you put in a pump, best to put it in line BEFORE the filter, not after, since otherwise if there's still a leak at the filter head you could continue having problems.

If you can't get hold of an electric pump, a manual primer bulb and an external fuel can elevated above the height of the IP can do the job as well, you can run it off that and see if the symptoms change.

I had one once where an injector stuck open and was letting compression get pushed through back into the IP, filling it with air, and did some similar things. Confirm there are no problems in the IP's fuel supply before exploring this though.

Did you refill the fuel tank shortly before this started happening?

Where are you located?
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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