Fuel Tank Hose help... 1968

[fes]

I thought you might be asking about the pressure test..do you have an air compressor? There are a few different ways of doing this, but basically you need to plug off the steel line where it exits out of the tunnel in the rear..air tight..
Then you need to make up some air tight fittings to hook up to the compressor set to 75PSI and listen for leaks..the best way is to do this test is to shut your compressor off and leave it for awhile,couple hours or even over night..if you check your gauge and it's still at 75, or close,you will be in good shape..

This is a rudimentary system I rigged up, but you get the idea..(also this is where having extra fittings,clamps and lengths of hose lying around is handy.) and notice the FI clamps, compared to the regular one in case you're wondering..

Piece on the left hooks up to the compressor and up front of the tunnel
Right piece goes on the rear exit hard line through tunnel..

Rear exit

There's obvious places for these homemade pieces to leak,but after some tweaking and tightening,I got them air tight..I'm sure there's better ways,but this worked for me..I eventually turned the pressure up to 90PSI and no leaks on my almost 50 year old hardline..
-Matt
_________________
'68 Campmobile-Pedro
'15 Golf-Stella Blau
'56 Oval-The Turd (for now)

[1967Ghia]

nice!! the pics and explanation really help!

i have a couple compressors my shop and lots of fitting around so i can rig something up like that

the fuel line is new but good idea to check for any kinks in it that might leak

might as well do it all while i have the tank out...

i don't want to have to take it out a third time =)

thx!!!

[c21darrel]

Nice pics showing process. Unless you plan on FI, 75 psi might be overkill even for testing. With a stock mechanical fuel pump and a thirsty dual carb 2 litre I am running right about 3 psi. just my 2 cents.
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[fes]

Yes, I agree, 75 PSI for fuel pressure would be insane,I run 2.5 on my Holley regulator from my Carter fuel pump for my dual 40s..I picked up on a thread here for testing the integrity of the fuel lines..figured if it could take 75psi,it could take gravity fed fuel (or pumped rear from the tank in my case) I could sleep better at night..VW did something right for sure,hiding that fuel line in the tunnel..protected and solid
_________________
'68 Campmobile-Pedro
'15 Golf-Stella Blau
'56 Oval-The Turd (for now)

[neon_guru]

Hi this thread has been very helpful. I am trying to reinstate the original fuel layout for my 71 KG and all the breather pipes have been cut and plugged. All is clearer now but I have an extra pipe that goes through the body under the right hand fender.

The top one goes to the T piece but what am I meant to do with the bottom one? Both of the pipes you see are cut and plugged

Thanks

[Redlabel6]

The bottom one should connect to the expansion tank and fuel tank, then run down the wheel well, connect to another line that runs under the pan to the rear wheel well, then up into the engine compartment and finally connect to the charcoal canister.

It takes the gas fumes out, back to the carb so they can be burned.

d
_________________
1957 Oval Window Beetle
1973 Karmann Ghia Coupe
https://www.thesamba.com/vw/forum/viewtopic.php?t=666792&highlight=73+coupe

[jeffrey8164]

[neon_guru]

I have what I think is a charcoal canister under the hood do I still need to take it to the engine compartment?

[Redlabel6]

No, that is the expansion chamber. It's just an empty can.
Supposedly fumes go into the chamber, condense back to gas and can be drawn back into the fuel tank. I'm not sure how that would work in reality.... seems dinkydow to me.

Excess fumes get pushed back to the charcoal canister in the engine compartment. Air is blown through the charcoal from the fan housing into the air cleaner where they are drawn into the carb.

That's my understanding of how the system works.

d
_________________
1957 Oval Window Beetle
1973 Karmann Ghia Coupe
https://www.thesamba.com/vw/forum/viewtopic.php?t=666792&highlight=73+coupe

[neon_guru]

Ok thanks I’ll take a proper look over the weekend

[John Moxon]

[Redlabel6]

Correct! It's pollution control equipment.
d
_________________
1957 Oval Window Beetle
1973 Karmann Ghia Coupe
https://www.thesamba.com/vw/forum/viewtopic.php?t=666792&highlight=73+coupe

[rbsurfguy]

Rehashing this topic for additional info

Looking for the hose size to connect to item #2 in pic. I realize this is the spillage/overflow pipe, but I can't figure out the size of the hose to connect to it. Someone in another post I can no longer find showed this connection connected to a copper pipe that mounts behind the pillar cover and runs down to bottom to drain fuel outside. Not sure if VW actually had a hose connected and would just let any overflow drain directly from the end. I have the pics printed out but still can't find the hose size for #2 and then what size copper tube was used.

Second, what is the size of hose in pic #4? It's a short piece that eventually routes back into the tank, I think pressure relief. But again, I can figure out the size of the hose marked #4, Anyone??

Thanks, Jeff
_________________
1971 Ghia convertible (Body off rebuild)
2019 VW Atlas 4Motion
2012 Passat-Sold


See my build on The Samba at:
Jeff's 71 Vert Restoration/Reassembly http://www.thesamba.com/vw/forum/viewtopic.php?t=6...highlight=

[Ian Godfrey]

I don't think there is a hose on #2.
my memory is #4 is 16mm, the last one I bought was from VW heritage
hopefully someone can confirm

[rbsurfguy]

Thanks Ian, as I've looked at more pics, I think you are correct that #2 doesn't route anywhere. Appreciate the hose size for #4, will look for that. If you confirm or someone else does on the hose size, that would be great.
Jeff
_________________
1971 Ghia convertible (Body off rebuild)
2019 VW Atlas 4Motion
2012 Passat-Sold


See my build on The Samba at:
Jeff's 71 Vert Restoration/Reassembly http://www.thesamba.com/vw/forum/viewtopic.php?t=6...highlight=

[LVGhia72]

I'm working on my gas tank right now. The vent pipe is approx 16mm. The hose size would be 17mm. Hard to find, most places don't carry or out of stock. This place has the hose,Belmetric located in MA. Could use 5/8 or 3/4 from local parts store. I know you want the good German braided. So like me, another wait for parts.

As you can see the pipe is about 16mm. Sorry the tape measure is a little off. Holding with one hand and taking picture in the other.

[rbsurfguy]

Thanks LV, I have the braided hose for that tube you are measuring, the one I am looking for is attached to the filler neck in the wheel well area, but in reality, I think it might be the same size. Should have tried the piece of hose I have to see if the same. Will def check for a 5/8 or 3/4 hose, black standard is fine as I think it is just for pressure release when you open the gas cap.
Jeff
_________________
1971 Ghia convertible (Body off rebuild)
2019 VW Atlas 4Motion
2012 Passat-Sold


See my build on The Samba at:
Jeff's 71 Vert Restoration/Reassembly http://www.thesamba.com/vw/forum/viewtopic.php?t=6...highlight=

[LVGhia72]

I'm pretty sure it's the same size. The question would be: is it flexible enough?

This pipe is the same size 16mm. It comes from the inner fender were it hooks up to the braided hose to the filler neck.
Edit: Ok this is the hose your talking about. Its looks original still on car.

Pretty crusty.

Other end of pipe

[rbsurfguy]

You know what, DUUUUUHHHHHHHHHHHH On MY PART!!! How dumb of me, didn't even put two and two together! I spend so much time staring at something and trying to figure out how to fix something and it went over my head! Not good, but I'll recover. Thanks for sledgehammering me back into reality!
Jeff
_________________
1971 Ghia convertible (Body off rebuild)
2019 VW Atlas 4Motion
2012 Passat-Sold


See my build on The Samba at:
Jeff's 71 Vert Restoration/Reassembly http://www.thesamba.com/vw/forum/viewtopic.php?t=6...highlight=