Fuel filter placement

by walter anderson in General Tech Discussion 11 years ago

Why is the fuel filter in my system on the inlet side of the mechanical pump.
Wouldn't you think it should be on the discharge side, last item the fuel see's before
the carbs, incase something in the pump comes apart (RANS S-7)

Re: Fuel filter placement

by Roger Lee » 11 years ago

Roger Lee

128 5.28k 4.98k

Hi Walter,

You usually do put filters on the supply side in almost all engines. All the planes that come into my shop are on the supply side except 1-2 that someone decide otherwise.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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Re: Fuel filter placement

by MARK JACKSON » 11 years ago

MARK JACKSON

12 332 11

Hi Walter

Our fuel filters are placed before the pump. The fuel pump itself has a fine filter in it. If the fuel is not filtered before it reaches the pump, the pump itself could become clogged.

Regards Mark

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Re: Fuel filter placement

by bill martin » 11 years ago

bill martin

10 757 0

I've always put mine on the supply side of the electric and mechanical pumps for the reason Mark mentioned. It has been my experience that while some trash can come from the plumbing, It more often comes from the fuel tank.

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Re: Fuel filter placement

by Bob Hartunian » 11 years ago

Bob Hartunian

3 23 0

You never place a filter between mechanical pump and carbs. Filters are placed at outlet of tanks so clean fuel goes to engine thru pumps. Should a filter get clogged, you can switch tanks and get clean fuel to engine. If you put a filter just before carbs and it gets clogged, no clean fuel can get to engine from any tank.

Thank you said by: Al C

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Fuel filter placement

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