[mcginkleschmidt]

This thread discusses the merits of fuel line hose, fuel injection hose and transmission line cooler hose. As I am looking to change out my radiator, radiator hoses and transmission line cooler hoses, I've been researching the specification of the above-mentioned hoses. It seems there is a wide specification difference and pressure rating between the three hoses and I thought other Titan owners might like to see the spec comparisons that I obtained from the Dayco website that deals with the automotive hoses. Based on my reading, I would be very cautious about using fuel line hose. Automotive hose specifications can be found here: Passenger Car and Light Trucks Parts - by Dayco

 

[mcginkleschmidt]

None of the local AutoZone and Advance Auto Parts had the Dayco brand of transmission oil cooler hose in stock but one of the close Autozone stores had the Goodyear 5/16" transmission oil cooler hose in stock, AutoZone Part #50281, Goodyear Part #65211. This stuff was unbelievably cheap at $1.19/ft., so I bought a seven foot length of hose to make sure I don't run short. The Goodyear hose is thick-walled hose so I may need the buy the next size up from 5/16" fuel injection hose clamps to accommodate the extra hose thickness. The Goodyear Oil Cooler Hose spec sheet is attached below.

After giving the Autozone counter person both the AutoZone and Goodyear part numbers, he cut and brought out a piece of generic fuel line hose that I promptly rejected. I found that as a buyer you need to be very specific when buying transmission oil cooler hose. Otherwise, you may well end up with the wrong hose if you are not mindful of what you are getting.

 

[mcginkleschmidt]

Its not the high pressure that will get you ... but, I am glad you feel comfortable and happy with a hose that will start to disintegrate into your transmission... :ftard:

I would agree that under normal operation that the transmission pressure is probably not that high but I wonder if that may change of there is a blockage or a filter is clogged. If the radiator goes there might also be a sharp rise in fluid temperature as well.

It makes better sense to use a hose that is specified for the use for which it is intended regarding temperature, pressure and chemical inertness. If one replaces the transmission hose with fuel hose without knowledge of the difference is one thing but, having been alerted to the difference between the two, might give cause to wonder about one's mindset.

 

[mcginkleschmidt]

you may notice from the links posted above that both hoses are manufactured from the exact same material.

That may be true but that information alone is meaningless. Acrylonitrile-Butudiene Rubber can be composed of different ratios of the base copolymers to effect the different needs and specifications for the intended use.

See image below that was taken from a pdf document found here: http://www.gupta-verlag.com/media/bookshop/rehearsal/extract_06.pdf

 

[mcginkleschmidt]

I don't believe that titan14 preferentially purchased the fuel line hose over the transmission hose or was even offered a choice between the two. I expect that he purchased and installed the fuel line hose and before learning about the difference and is reluctant, at least in the short term, to change out the hose.