Fuel line question

Rich'sToys

Well-known Member
Location
Southern MN
I recently got hold of some 5/16" transmission oil cooler hose. Since transmission oil is a petroleum product, I assume I can use this hose as fuel line, correct? Or am I missing something?
 
It will work as long as the pressure is within the rating

For carburated engine, or diesel on the suction side it will work, but fuel injection is higher pressure, usually up around 60 PSI.
 
Shouldn't be a problem. But depending on where you live and the blend used. I would keep an eye on the line. I would say 95% ok.
 
Fuel line hose is rated as such (eg. SAE 30R6) and its rating will be printed on it.

You don't say if you intend to use this hose for gas or diesel, but I would sure want any hose carrying gasoline to be properly rated for it. 5/16" fuel line is not that expensive, don't take a chance.
 
"Or am I missing something? "
You are missing something. Transmission fluid doesn't have ethanol in it,,,,,,,,yet. Hose rated for petroleum is destroyed daily by ethanol on everthing from cars to lawn mowers.
 
The ethanol angle had occurred to me, but wasn't sure if that would be an issue or not.
I'm installing an electric fuel pump in an old International truck and planned to use the hose to bypass the existing mechanical pump. It's not going to get used a lot.
 
Trans oil cooler uses SAE 30R2 usually. You want SAE 30R6, 30R7, 30R9, or 30R14 Type 1. 30R14 has a thin plastic permeation barrier extruded between the inner tube and the reinforcement to keep fuel vapor (from the ethanol) from degrading the reinforcement and to protect the outer hose cover from getting crusty looking over time. This would be Gates 4219BG. You can also use Gates 4219G, 4219D, or 4219XL.
 

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