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leaking excess fuel return line on 172-D

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richard d hayes

Joined: 26 Jun 2010
Posts: 62
Location: North Central Florida

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PostPosted: Mon Nov 25, 2013 4:08 am    Post subject: leaking excess fuel return line on 172-D Reply to specific post Reply with quote

On my 172-D there are two fuel return lines from the engine. One from the fuel pump that goes to the "T" in the bottom of the fuel tank in a horizontal position. (In my manual, page 123, fig. 22) This line is rubber, secured with a clamp, and does not leak. The other line from the engine head is also rubber and goes to the vertical part of the "T" and is constantly leaking and falling off. I have put several types of clamps on the connection but nothing seems to work. The small protrusion the hose connects to is quite short; maybe 1/4 inch at most. Question: what type of tubing and connector is best to stay on and not leak? The small nipple looks like it has a grove cut around the top of it and feels like it might be hexagon in shape. Looking at the figure on page 123, it looks If so, what type of fitting. If rubber will work, does anyone have a type of clamp that may stay on. Any help would be appreciated.
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Joined: 21 Jan 2013
Posts: 1095

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PostPosted: Mon Nov 25, 2013 7:03 am    Post subject: Re: leaking excess fuel return line on 172-D Reply to specific post Reply with quote

The line that is leaking was originally steel tubing as I recall. The 1/4" long piece of tubing that you are trying to connect the rubber hose to is probably all that's left of the original. It should be connected to the large fitting that screws into the bottom of the tank with a compression fitting. Remove the compression fitting and the short piece of tubing and take it to an auto parts store. They should be able to fix you up with a longer piece of tubing so that your rubber hose will have more tubing to slide over and get a good grip with a clamp.
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