Mercruiser MCM 140 - Fuel pump sight glass tubing

Kdreese89

Seaman Apprentice
Joined
Mar 12, 2017
Messages
36
Does anyone know what the I/D and O/D of the Tygon Tubing used on the Mercruiser MCM 140 (1985) that runs from the Carb back to the fuel pump if the diaphragm ruptures? The one on the engine I just bought has become extremely rigid and detached from the fuel pump and I do not trust it for measuring since it is wrapped so badly.

Thanks
 
Joined
Jul 6, 2015
Messages
19
I couldn't find the tubing in the auto store so I got it from my Mercruiser dealer. Don't run the boat without that tube. If the fuel pump leaks without the tube you'll have a gasoline leak.
 

Bondo

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Apr 17, 2002
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70,465
Ayuh,.... I believe it's 1/4", or 5/16" tygon tubin',...
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
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Jul 23, 2011
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47,300
Lowes and home depot have clear tubing in the lawnmower repair section
 

Kdreese89

Seaman Apprentice
Joined
Mar 12, 2017
Messages
36
Well the LowCheapo Depot special did not work. They only had up to 1/4 O/D Everbilt "fuel" tubing. So now I need to figure out the actual size and order the line.
 
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