glass tube fuel filter

by Vernon Goodrich in 2 Stroke Technical Questions 10 years ago

OK I need help. I noticed that my 582 seems to be pulling all but, a small quantity of the fuel out of the glass tube fuel filter. I had a loss of rpm during climb out a month ago. Back on the ground I noticed rpm variations from 6000 rpm to 4900 rpm, this continued for several minutes. I shut the plan down and installed a new fuel pump, rebuilt carbs, replaced the primer, and cleaned the fuel filter. Pulse line is newer and about 16" long.
Started plane after rework and noticed the fuel being pulled from the filter to almost nothing. I removed the two fuel caps, no change. I disconnected the fuel filter from the gas supply line on the tank side and opened each shut off valve to check fuel flow. IT SEEMS ADEQUETE

Re: glass tube fuel filter

by Vernon Goodrich » 10 years ago

Vernon Goodrich

4 4 0

I left the fuel shut off valves open over night thinking it may displace air in the lines between the filter and carbs. The following morning I started the engine and ran it between 4500 and 6000 rpm's and noticed that the fuel in the tube did not diminish. GREAT....After I re-attached the filter with new rubber and plastic ties I pushed the plane in the hangar, tied it down, and started packing my tool box.......I heard this noise that sounded like water pouring from a water faucet into a fiberglass sink that had been turned off. What the H#!! is that. I did not replace the short piece of fuel line from the Tee to the fuel filter and during the re-attachment of the filter the movement most have ....well saved me from an engine out and a lap full of fuel

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Re: glass tube fuel filter

by jay white » 10 years ago

jay white

36 97 23

I was just curious, how old was that broken line? guess?

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Re: glass tube fuel filter

by Vernon Goodrich » 10 years ago

Vernon Goodrich

4 4 0

Two years and five months old.

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Re: glass tube fuel filter

by Roger Lee » 10 years ago

Roger Lee

125 5.12k 4.53k

That style of tubing seems to be more of a hold over from days gone by.
I wouldn't ever use that type of tubing. It is prone to early failures from sun rot, vibration and hardening. There is no reason to use clear tubing or our cars, trucks, motorcycles, boats, ect... would all have it. What certified aircraft have you ever seen plain poly plastic fuel line?

All fuel hose should be just that, rated fuel hose like rubber fuel hose or at a minimum the clear fiber re-enforced plastic tubing. Personally I'm not a fan of the clear fiber re-enforced tubing because it can still sun rot and gets hard too soon. Severe cold can cause a failure too if vibration and age play a factor.

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

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glass tube fuel filter

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