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Author Topic: Huco pump not shutting off  (Read 450 times)
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JohnFol
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« on: August 31, 2020, 10:38:58 AM »

Finally fitted a Huco 13310 to a carb engine (vertically) Spins up fine suggesting inertia switch, relay and pump wiring all good and engine gets good supply of fuel(as seen in fuel filter before pump)
I've done the crude "blow down return pipe"so I know it's clear.
Pump described as not needing regulator so I'm expecting the pump to automatically stop when not required.

Quick test shows with engine off the pump continues to pump. I can hear it "pulsing" under strain and it's clear it's trying to pull more fuel.

Any suggestions?
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peteracs
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« Reply #1 on: August 31, 2020, 11:09:47 AM »

Hi John

A couple of questions....

You say engine off and still running, do you mean engine off and ignition off, or engine not started but ignition on?

If you have the return pipe still active, there will be no back pressure on the pump, hence the pump will keep pumping I would have thought?

Peter
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JohnFol
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« Reply #2 on: August 31, 2020, 11:47:12 AM »

Just clamped the return pipe from carb and it shuts down.

I had assumed the carb float acts a bit like a ball valve giving back pressure.


Many thanks
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WestonE
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« Reply #3 on: August 31, 2020, 04:54:01 PM »

Hi John

normally with interrupter pumps the return is deleted. I strongly recommend a filter king regulator set to 3PSI. You will consistently have the right pressure avoiding rich running from the float needle being pushed open and all you need for full bore fun.

Eric   
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peteracs
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« Reply #4 on: August 31, 2020, 05:19:54 PM »

Just clamped the return pipe from carb and it shuts down.

I had assumed the carb float acts a bit like a ball valve giving back pressure.


Many thanks


That poses a good question. I understand why with a mechanical pump there is a return, but without going back to my carb, does the return come off the float chamber or is it before that, which means the float does its job and you still get a flow of fuel?

Peter
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JohnFol
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« Reply #5 on: September 01, 2020, 10:51:33 PM »

I'm expecting the Huco to run at 2.2 psi so not sure capping it with a regulator will take pressure off the float.  Need to read up more to see if I can understand Peter's question more.
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mangocrazy
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« Reply #6 on: September 11, 2020, 06:20:48 PM »

Mechanical fuel pumps need a return path as they have no means of not pumping once the float bowl is full. Electric pumps sense resistance when the float bowl is full and (when working correctly) stop pumping. As you surmised, with a return path available using an electric fuel pump, the pump will continue pumping as it never sees resistance. Agree about not needing a fuel regulator, as the Huco fuel pump is self regulating and is set at a lower pressure than 3 psi.
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JohnFol
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« Reply #7 on: September 12, 2020, 04:54:38 PM »

I had a fuel non return valve in the garage so just added it in reverse (after carb) and all ok. First few drives were anxious but good.
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