Fuel Leak help needed

[WPS 73 Bronco]

I've owned my 73 Bronco now for 5 weeks. What a mess. I can't wait to get all the little stuff worked out. Today's new item is a leak on the primary fuel tank. When I filled up the Bronco today, I "topped-off" the tank with an extra squeeze of gas. Then went to fill the aux tank and then done. When I went to put the cap on the tank, I notice that that extra squeeze was now spilling out underneath the truck. When I looked underneath, it appeard that the gas was flowing from on top of the tank, which I assumed was a leak in the filler hose.

I've already replaced a leak in the auxilary filler hose as it did the same thing the first time I filled it up.

So....experts, does it sound like I've got the same kind of issue going on with the main tank or is there another possible culprit? It also appears that this is a new replacement tank.

 

[half cab]

Previous owners of some these old rigs were known to drill,punch or what ever holes it the tanks especially the aux. from the top side due to drilling holes in the floor pans.

Just saying

 

[56f100bbw]

Previous owners of some these old rigs were known to drill,punch or what ever holes it the tanks especially the aux. from the top side due to drilling holes in the floor pans.

Just saying

It could happen

 

[billh1289]

Besides the fill and vent there are probably 1 or 2 small nipples for the vapor system. See if the lines are still hooked up and in good shape.

 

[WPS 73 Bronco]

Which tank is under the driver seat? That is the one that leaked. I've filled the Bronco up 3 times now and this is the first time I noticed it. I've not added anything to the floor board other than installing new seats, which used the exisitng bolt holes.

 

[WPS 73 Bronco]

Besides the fill and vent there are probably 1 or 2 small nipples for the vapor system. See if the lines are still hooked up and in good shape.

I was messing around with the vapor system the other day. Maybe I knocked the hose off of that????

 

[billh1289]

Which tank is under the driver seat? That is the one that leaked. I've filled the Bronco up 3 times now and this is the first time I noticed it. I've not added anything to the floor board other than installing new seats, which used the exisitng bolt holes.

Aux tank is under driver seat, main tank is in rear.

 

[WPS 73 Bronco]

So it appears that the vent line that's attached to the tank is leaking. It's not the rubber hose, but appears to be the actual fitting on the tank is leaking.

Is this a seal-welded joint or a torqued fitting?

From underneath the truck, this is the highest connection on the aux tank. Appears to be a 3/8" nipple on the connection that point up. It's connected to a rubber hose which I'm assuming goes to the vapor canister.

Thoughts ?

 

[raleigh_bronco]

Sounds like you have a 23 gal tank? I think a lot of folks leave the vent port ’open’

 

[tpatton75]

Some 73 had a vent and a return line they are plastic weld and brittle . I do not know if replacement tanks have the extra port

 

[tpatton75]

This is from my 73

 

[WPS 73 Bronco]

Mine looks similar, but that top nipple has a 90 degree turn in it. Mine also looks relatively new. The tank only has about 12 gallons of capacity.

In that pic of yours, is that nipple screwed in or welded shut? Looks like it's a screw in.

 

[tpatton75]

I will check tomorrow

 

[tpatton75]

Threads with a 12” tube

 

[WPS 73 Bronco]

Thanks. I’ll take a look this weekend and see if it will tighten up a bit.