Can anyone help me?

[Mrtn15]

The other day I was driving down the road, and my truck died, it seemed like the lights faded out and all' I replaced my alternator amdthat wasn't the problem! So I pulled the line off the carb and it's getting no gas, so i replaced fuel pump.. And still no gas! I filled it up that day, so i know there's gas In it, can anyone help me? It's dual tanks with a 350 and a 650 Edlebrock carb.
When I put gas in the carb and the fuel line it runs for a few seconds and dies!
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[1LowToy]

You can put a vacuum gauge on the inlet of the fuel pump to see it does have suction. Sounds to me that you may have a leak in one of the hoses coming from the fuel tank or a malfucntion with your tank switch. Any way you look at it the pump is not drawing fuel from the tanks. Check your hoses at the switch under the cab and at the fuel tanks.

[J Knight]

Probably the tank selector valve under the truck shorted out and is stuck inbetween tank hoses, draining your alt juice and blocking off the fuel.

[meter swinger]

^^^^ x2
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[Mrtn15]

Originally Posted by J Knight

Probably the tank selector valve under the truck shorted out and is stuck inbetween tank hoses, draining your alt juice and blocking off the fuel.

I did see some gas leaking from under there, but for some reason theres like a hard plastic line that's been cut and capped off, you know what this is ?

[Mrtn15]

Originally Posted by 1LowToy

You can put a vacuum gauge on the inlet of the fuel pump to see it does have suction. Sounds to me that you may have a leak in one of the hoses coming from the fuel tank or a malfucntion with your tank switch. Any way you look at it the pump is not drawing fuel from the tanks. Check your hoses at the switch under the cab and at the fuel tanks.

That's what I did all day today. I didn't find anything but i didnt check the suction I will do this tomorrow thanks!

[J Knight]

Originally Posted by Mrtn15

I did see some gas leaking from under there, but for some reason theres like a hard plastic line that's been cut and capped off, you know what this is ?

Before your truck died were both tanks functional?

[meter swinger]

Im not home right now or i would look at mine (78). My left tank leaks from the filler neck so i dont use it. ill check it tomorrow.
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[Mrtn15]

Originally Posted by J Knight

Before your truck died were both tanks functional?

No, they weren't! however, they worked when I got the truck And I used both for a while, & I stopped, and hadn't tried it for about a year now. Is there a way to bypass this switch ?

and could something in the tank or lines be clogged?

[Mrtn15]

Originally Posted by meter swinger

Im not home right now or i would look at mine (78). My left tank leaks from the filler neck so i dont use it. ill check it tomorrow.
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I can snap a picture of it for you tomorrow also!

[J Knight]

You can remove the lines from the valve and pic your favorite tank and hook them up direct. If you are still having alt problems you can un plug selector valve but your gas gauge wont work.

[Mrtn15]

Originally Posted by J Knight

You can remove the lines from the valve and pic your favorite tank and hook them up direct. If you are still having alt problems you can un plug selector valve but your gas gauge wont work.

okay, do I need to replace the lines for rubber hose, or what do I do in that situation! and I don't think I have alt problems now. I have two big amps on my stereo system.. lots of load for an old alt

[J Knight]

Originally Posted by Mrtn15

okay, do I need to replace the lines for rubber hose, or what do I do in that situation! and I don't think I have alt problems now. I have two big amps on my stereo system.. lots of load for an old alt

There are 3 lines from the motor, 3 line from the left tank, and 3 lines from the right tank. They all meet at the selector valve. Connect the 3 lines from the tank you want to use to the lines from the motor. You can use the rubber hoses you already have. The 3 set of lines are different sizes so you cant get them wrong if you pay attention.

[Mrtn15]

Originally Posted by J Knight

There are 3 lines from the motor, 3 line from the left tank, and 3 lines from the right tank. They all meet at the selector valve. Connect the 3 lines from the tank you want to use to the lines from the motor. You can use the rubber hoses you already have. The 3 set of lines are different sizes so you cant get them wrong if you pay attention.

I see! do one of lines come from the fuel pump ? I know one one line comes off of my fuel pump to my rear axle..

[J Knight]

Originally Posted by Mrtn15

I see! do one of lines come from the fuel pump ? I know one one line comes off of my fuel pump to my rear axle..

The big line goes to the vaper canister.
The medium line is the fuel line.
The small line is the return line.
The line to your rear axle is a brake line.
All the lines run along the inside of the right frame rail, they disapear behind the motor mount brace, you are probably mistaking one line for another.

[Mrtn15]

I think mine may be rigged, I just went and got a video, do you know how id post it ?

[J Knight]

Originally Posted by Mrtn15

I think mine may be rigged, I just went and got a video, do you know how id post it ?

Dont Know. Im lucky I can type wiyh more than one finger, much less comp tech.

[Mrtn15]

I figured it out, and I know what you mean about the typing with more than one finger haha

YouTube - ‪Selector...

[J Knight]

Its a short vid but it looks like its hooked up right. That cap looks factory and if it wasnt a problem the hole time youve hade the truck it aint a problem now.
Since you crawled up under the truck, has what I explained a little more clear now?

[Mrtn15]

Originally Posted by J Knight

Its a short vid but it looks like its hooked up right. That cap looks factory and if it wasnt a problem the hole time youve hade the truck it aint a problem now.
Since you crawled up under the truck, has what I explained a little more clear now?

yes it is a lot more clear! I took the stupid cover off of the switch and now that I can see it, I understand alot better! thanks alot man! & you think tht if i bypass this, My truck will work again ?

[J Knight]

Its very possible and it wont cost any thing but elbow grease to find out.
Wich tank do you want to use?

[Mrtn15]

I want to use my right side tank!

[Mrtn15]

Originally Posted by J Knight

Its very possible and it wont cost any thing but elbow grease to find out.
Wich tank do you want to use?

is there anything that ever goes wrong with the gas tank hardware ?

[J Knight]

OK, take the 2 lines of the front of the valve that go to the motor.
Take the 2 line off the rear of the valve that go to the right tank.
Conect the 2 lines from motor to the 2 lines from the right tank.
Dont worry about the 3rd line thats T-ed off, and not connected to the valve because its just a vaper line. Then see if itll start.

[Mrtn15]

Originally Posted by J Knight

OK, take the 2 lines of the front of the valve that go to the motor.
Take the 2 line off the rear of the valve that go to the right tank.
Conect the 2 lines from motor to the 2 lines from the right tank.
Dont worry about the 3rd line thet T-ed of thats not connected to the valve because its just a vaper line. Then see if itll start.

okay i will go do that right now.