Fuel tank 3 hoses?

[Crom Cruach]

I’m trying to sort the stuck fuel gauge and while I’m under here checking the ground connection. There are 3 hoses coming out from the tank, can anyone tell me what they are and where they go? 
 

 

the one I’m holding here is totally corroded

[Dtret]

The three in your hand, two go to the fuel sender , the other goes to the nipple ( sorry Glen) on the tank. I think there may be two more but I’m not sure on a 72. 

[Glen]

12 hours ago, Dtret said:

The three in your hand, two go to the fuel sender , the other goes to the nipple ( sorry Glen) on the tank. I think there may be two more but I’m not sure on a 72. 

No need to apologize, Dennis.  Now had you segued into that corroded line lactating fuel is when I would’ve thought you might be outta pocket 😂🤣

[Crom Cruach]

Ok I’m having black coffee this morning! The corroded line - is this the one that goes to the fuel nipple? What does it do? What effect will the corrosion have on the system?

[Dtret]

It should just be a vent line. Corrosion is not the best but it should cause no issue until you start smelling fuel fumes. 

[MC1of80]

I believe in line tube sells the lines/tubes. 

[stangeba]

I didn't see what year your Monte is. This is what my 71 looks like.

Inside one of the hoses is a small plastic restrictor. When I changed my hoses, I almost threw it out!  

[Dtret]

His is a 72. I didn’t know if 72 had the vapor box behind the seat.  That’s why I didn’t know about the two outside lines but the three in the center should eventually end up at the same place. 

[jft69z]

72 does have the vapor chamber behind the rear seat. The gas tank may have a couple of vent lines on the outside corners too.

[Scott S.]

Basically, one goes to the fuel pump, one returns from the condenser can, (early emission control) and one leads to the plastic vent thingy..... (to open air)

[Crom Cruach]

5 hours ago, stangeba said:

I didn't see what year your Monte is. This is what my 71 looks like.

Inside one of the hoses is a small plastic restrictor. When I changed my hoses, I almost threw it out!  

Ok lads, based on Stangeba’s (very useful) diagram, those three hoses are metal, and are the same three I see in this photo…

 

so the two rubber hoses (in my first photo) go to the pump, and return from condenser, is that right? Could explain my intermittent stuttering engine issue if the corroded one is to the pump. 

[Dtret]

Could explain it but as ugly as they are, if they are not leaking they are still doing their job. My bet is that you could probably eliminate ( I wouldn’t) the vapor chamber and it would run no different. I’m not sure on that but as long as you’re still venting to the vapor canister under the hood you would be good. Like I said I wouldn’t do it but I’m sure people have. 

[jft69z]

What vapor canister under the hood.....lol.

[Crom Cruach]

Thanks Dennis, don’t want to change anything, just want to fix my fuel issue and get the gauge working. Here is the Vapor chamber on my ‘72

[stangeba]

Yes, I still have it! The vacuum diaphragm (round thing on top) did have a leak so I bought a replacement charcoal canister with a new diaphragm. I think the large hose comes from the rear tank area, the small hose on top acts as an on / off switch allowing the fumes stored in this canister to be sucked into the running engine via the hose just below it.     

[Dtret]

1 hour ago, jft69z said:

What vapor canister under the hood.....lol.

Where them two empty core support holes are. If I did mine like you did that would have ended up in the basement somewhere. Useless garbage. 

[Scott S.]

23 hours ago, Crom Cruach said:

Ok lads, based on Stangeba’s (very useful) diagram, those three hoses are metal, and are the same three I see in this photo…

 

so the two rubber hoses (in my first photo) go to the pump, and return from condenser, is that right? Could explain my intermittent stuttering engine issue if the corroded one is to the pump. 

More likely a bad filter... Have you pulled the sender unit and looked at the tank and pick up sock ?? 

There might be some corrosion at that end.

[Crom Cruach]

I looked at the filter - it’s paper - and it seems good, but I have a brass type coming from TPP.

Is the sender unit the part on the tank that sends info to the fuel gauge? Drop the tank job yeah?

[Dtret]

Yes drop the tank. The sender has a ring around it that turns off. They make a special tool to get the ring off. But usually gentle persuasion with a hammer and chisel ( or something like that) wool get it done. 

[Crom Cruach]

On 4/26/2022 at 2:18 PM, stangeba said:

I didn't see what year your Monte is. This is what my 71 looks like.

Inside one of the hoses is a small plastic restrictor. When I changed my hoses, I almost threw it out!  

Finally got the tank out today. What is this restrictor? Which hose is it in? I’m putting it back together tomorrow and I didn’t see anything like this!

[stangeba]

It may have already been thrown out. To be honest, I don't remember for sure but I remember the hose labeled "VENT PIPE" has a oval drawing on the hose and I assumed that is where it went. Where I put it, I can't remember for sure, sorry.

 

 

[Crom Cruach]

On 4/26/2022 at 2:18 PM, stangeba said:

It’s weird, it looks like it just stops the flow, what’s the point? Then again the whole venting vapors behind the rear bench is a bit weird! 

[stangeba]

7 minutes ago, Crom Cruach said:

On 4/26/2022 at 9:18 AM, stangeba said:

It’s weird, it looks like it just stops the flow, what’s the point? Then again the whole venting vapors behind the rear bench is a bit weird! 

There is a small hole in that blue plastic plug.

[Crom Cruach]

that makes more sense alright