General question on small fuel pump operation?
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Laughing Gas
Joined: Jan 2022
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General question on small fuel pump operation?
If I have a gravity feed line from an aux diesel tank in the bed and I add a small pump. Would the fuel continue to gravity feed if the pump is not energized?
Fleet Mechanic
Joined: Oct 2022
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From: Dallas Metroplex
Lead Driver
Joined: Nov 2005
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Maybe, but at the least flow would be slowed down quite a bit.
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Laughing Gas
Joined: Jan 2022
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Depends upon the pump, I'd guess. If you're concerned about flow control, install a cutoff valve (such as this: https://www.ebay.com/itm/154758122093). After the pump, obviously.
Cargo Master
Joined: Jul 2011
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From: Walpole, MA
IMHO, no. The pump would probably still let fuel pass through while a closed solenoid definitely won't.
Fleet Mechanic
Joined: Oct 2022
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From: Dallas Metroplex
Anyway, I'd recommend researching the pump manufacturer specs of whichever pump you're looking at, and ensure that their pump doesn't allow flow when not powered on. Most don't, in my experience, but confirm with the manufacturer specs...
Also, if you're concerned about flow from gravity, just mount the pump above the level of the tank from which you're using to pump fuel, simple solution. But, if you absolutely want to stop flow just use a powered cut-off valve.
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