Fuel injection hose for submersion in gas tank

[tom h]

As some of you may know, standard SAE 30R9 fuel injection hose is not rated for submersion in gasoline. The outer jacket is said to swell and eventually the hose will fail.

eg, see:
http://www.gates.com/europe/brochure.cfm?brochure=3014&location_id=2958
or
http://www.acdelcotechconnect.com/pdf/tsb/tsb_fuel_line.pdf#search="acdelco fuel hose filetype:pdf"

SAE 30R10 hose is rate for submersion. The application is the short section of 3/8 hose connecting the output of an aftermarket fuel pump to the fuel sender's 3/8" metal output tube.

I have searched and found the correct part # for this 3/8 hose:
Gates Hose # 27097 .

After calling 5 Gates distributors, I found one who knew what I was talking about, and is ordering the hose.

It comes in 1 ft lengths, costs about $13. Pricey, but it seeems to be the right hose to use inside the gas tank.

 

[tom h]

whoops !
I discovered the size of the fuel hose inside the tank is 5/16", not 3/8"
The 3/8 steel tube actually reduces to 5/16 to match the fuel pump outlet.

Gates Hose # 27093 is the 5/16" ID submersible hose, SAE 30R10 spec.

Sorry if I led anyone astray.

 

[Louie L.]

One of the 1st mods to be included with a fuel pump install is to remove this neck down part of the fuel line to allow more flow. So in essence your information is very usefull ...both ways..

 

[Ormand]

The instructions for installing a new fuel pump include a step for opening up the end of the tube. (on the other board) Earl Brown cut it off with a wheel, but others, including Steve Wood, recommend just reaming the opening. But I didn't understand these directions as "enlarging" the tube, just getting rid of the restriction at the tip.
There are some close up pictures, and the end of the tube is rounded off, to make it easier to slip a hose on it, but is not swaged down. Now I'm confused about the size of hose needed.

 

[tom h]

I also saw how Earl Brown cut off (apparently) the 5/16 section of metal tubing on the sender assembly, so that only 3/8 tubing remained on the outlet. But the typical fuel pump's hose barb is 5/16.

3/8 fuel hose won't clamp onto 5/16 fuel pump. Is the idea to use 5/16 fuel hose and somehow stretch it to fit over the 3/8 metal outlet tube? That doesn't seem possible without damaging the hose.

Using 5/16 hose and then enlarging the necked-down restriction on the 5/16 outlet tube seems the practical solution -- or am I missing something?