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Electric fuel pump no fuel flow on low

ABS Full Member
Posts: 7

When I turn my electric fuel pump on low with full throttle (with the engine off) I don't have any fuel flow. If I turn it on high there is plenty of fuel flow.

Is it time to overhaul my fuel pump?

Does anyone have a part number and a place you recommend buying from?

My aircraft is:
A36
Engine: IO550-B (29) S/N 682389

Model: Bonanza A36
Aircraft Serial Number: E-3043
Posted 10/29/2020 - 4 weeks ago
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ABS Full Member
Posts: 1161

Do you hear the pump running at LOW? Do you have a fuel flow indicator other than the factory flow gauge?

The LOW position only propels about 3/4 to 1.5 GPH, so it may not register on the factory flow gauge. LOW‘s function is primarily to increase fuel pressure, not flow rate.

Posted 10/29/2020 - 4 weeks ago
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ABS Full Member
Posts: 7

I can hear the pump running while on low and yes I only have the factory flow analog guage

Posted 10/29/2020 - 4 weeks ago
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ABS Full Member
Posts: 1161

Your auxiliary pump appears to be working properly, then.

Posted 10/29/2020 - 4 weeks ago
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ABS Full Member
Posts: 114

The electric aux fuel pump is a 10-year recommended item for OH / replacement. Recommend checking your years in service as well as output at high with mix and throttle full forward prime. It should be in the 75% plus range of your take off fuel flow; remember, if your engine driven pump dies on take off, your aux pump is all you have to stay in the air. Important item.

Posted 10/29/2020 - 4 weeks ago
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Electric fuel pump no fuel flow on low