What is the second fuel line for? (1 Viewer)

[MatthewMcD]

Taking a break from my ignition issues to ask a question about fuel lines.

My "75 FJ40" does not have the original engine. (Or Carb ) There are 2 fuel hard lines bolted to the chassis rail under my hand. One goes to the fuel filter and on to the fuel pump. The other is in my hand and, up until our recent freeze, was plugged with "some gooey material". Apparently, the freeze caused that plug to fail and I had a leak from this fuel hose. I plugged it with the bolt shown in the photo to stop the leak. My question is, what is this second fuel line for? Should it be plugged? If it drops below the gas tank fuel will flow out of it.

 

[rkymtnflyfisher]

Some fuel pumps have a fuel return line.


How many lines are on your fuel pump?

 

[igotta40]

Auxiliary fuel tank?

 

[charliemeyer007]

Somewhere around that year the carb had a return to the tank fuel hose. Bolt and hose clamp makes a fine plug IMHO.

 

[wolfbak]

Mine was also plugged on my '76. It's a return fuel line.

It will come in handy when you install the EFI system

 

[South Texas 97]

Same on my 76 it is a return fuel line.

 

[mattressking]

All 2F (75-84) 40s have a feed and return from tank to the fuel pump. Fuel pump to carb fuel line is dependent on fuel pump/carburetor.

 

[MatthewMcD]

Thanks everybody. This is not the original carb, but I'll check the fuel pump. I am sure it got capped of as a result of the engine swap.

 

[MatthewMcD]

All 2F (75-84) 40s have a feed and return to the fuel pump. Fuel pump to carb is dependent on fuel pump/carburetor.

That would explain it. I don't have a 2F. I'll take a look at the fuel pump.

 

[mattressking]

That would explain it. I don't have a 2F. I'll take a look at the fuel pump.

What engine?

 

[MatthewMcD]

What engine?

It appears to have been assembled from several different engines. Some folks say it's a F1.5 others have noted that some of the parts "appear to be from a '68". I have photos in my initial post: My First FJ40 My Introduction - https://forum.ih8mud.com/threads/my-first-fj40-my-introduction.1319484/

 

[mattressking]

It appears to have been assembled from several different engines. Some folks say it's a F1.5 others have noted that some of the parts "appear to be from a '68". I have photos in my initial post: My First FJ40 My Introduction - https://forum.ih8mud.com/threads/my-first-fj40-my-introduction.1319484/

Everything about that still looks like an F to me, except the aftermarket carb. 4spd still?

 

[MatthewMcD]

Everything about that still looks like an F to me, except the aftermarket carb. 4spd still?

Yes, 4 speed.