Gas Tank and other Questions

[Sodak]

Got a 78 chevy duel tanks and this truck has lived a hard life ,not sure if these are the original tanks/sending units or not.Basically it has three lines coming out,1 is the main line @ is a vent(to where i have no idea) and 3rd is the return.
Now my question is ...How do i go about hooking these up ,And to what, in the manual it says i needed a three port one wire tank diverter(Got it) also there is no extra port on the mechanical fuel pump and again don't know where the vent goes. would it just be easer for me two replace the sending units with a two port?

Next question.
Where do i find gas tank filler hoses? Can't seem to get themat a chain store or online that i can find.If someone can steer me in the right direction i'd appreciat it.

And finally(for now) i have a 73-74 grill and the bowtie is missing (sticker part) where can i get a new one .She just doesn't look right without it.

Thak you guys for any and all help.

Shane

[frog210]

i think there should be a canister where the vent goes

about the filler hose i think a member here said that they had used like a radiator hose dont quote me tho

[GM-power]

The vent line goes to the charcoal canister in the engine bay. There are two ports on the pump. The larger one is the supply smaller is return. The vent goes from tank to canister non on the pump. And as for a filler hose I think a radiator hose would work.
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[Sodak]

Thanks for the reply,sorry but I have no cannister neer the fuel tanks,and won't gas eat a radiator hose? guess i'll have to call napa in the mornin and see.

Just noticed the reply above and i have no cannister in the engine compartment or a second port on the pump,can i just leave them pluged like i found them or should i get a 2 line sending unit?

[GM-power]

The canister is located in the RH front side of the engine bay right by the radiator. You don't need one but when your around the truck it will smell like gas.
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[Sodak]

What about just leaving it pluged like i found it?

[GM-power]

That's a bad idea. If you have the fuel vapors building up it'll pressurize the tank and could explode. Oh and classic industries does have a filler neck, and im sure they have a charcoal canister as well.
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[frog210]

i didnt have that canister on my 74
its only two pronged on the sender

[Sodak]

Originally Posted by frog210

i didnt have that canister on my 74
its only two pronged on the sender

See thats what i'm wondering can i replace my 3 port sending unit with a 2 port? and where does the second port go by the way?

Originally Posted by GM-power

That's a bad idea. If you have the fuel vapors building up it'll pressurize the tank and could explode. Oh and classic industries does have a filler neck, and im sure they have a charcoal canister as well.
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Sorry i guess i'm not explaining things too good here,The metal part is fine it's the gashose i can't find,As in discontinued so says napa.but if like you say radiator hose should work then i'll try to match something up there.i just thought gas would eat it for some odd reason.

[GM-power]

Classic industries part#G2666
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[Sodak]

Still in the catalog but discontinued i am going to try the 70-81 version part #g2670

[motornut]

my Jimmy 78 didn't come with the cannister
79 did tho
78 stock 305 2 gas lines
79 stock 305 3 gas lines

for me it was 3/8 feed
5/16 vapour
1/4 liquid return

[motornut]

not the tank vent eh?

[Sodak]

Originally Posted by motornut

my Jimmy 78 didn't come with the cannister
79 did tho
78 stock 305 2 gas lines
79 stock 305 3 gas lines

for me it was 3/8 feed
5/16 vapour
1/4 liquid return

In the first pic i see the cap on the end of the vent line where do i get thoseand second i think i will order two -two line sending units .I don't have the lines any way or the cannister,so no sence confusing me or some one in the futer with what should or should not be there.and that last pic i don't even want to know where all those lines go.lol
Thanks guys for all the help on this issue i appreciate it.

[motornut]

Originally Posted by Sodak

In the first pic i see the cap on the end of the vent line where do i get thoseand second i think i will order two -two line sending units .I don't have the lines any way or the cannister,so no sence confusing me or some one in the futer with what should or should not be there.and that last pic i don't even want to know where all those lines go.lol
Thanks guys for all the help on this issue i appreciate it.

Those are used as diff vents too
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