Fuel not getting to carburetor

GDUUUU

MEMBER
1974 DODGE TRUCK
V8
2WD
AUTOMATIC
700,000 MILES

This truck has not been started in about ten years. I decided to work on it to make it run again. It turns over fine, but gas is not going into the carburetor.

It starts fine when I put fuel directly in the carburetor, then dies after a couple seconds.

It has a new fuel pump and none of the hose are clogged. I noticed that the line that goes from the fuel pump to the carburetor is dry and no fuel at all, but again, not clogged.

Any ideas?

6 Replies

HMAC300

MECHANIC
48,601 POSTS

It could be a couple of things, it may be clogged from tank to pump, pump lines are hooked up backwards or the fuel pump is not hitting the cam from lever being installed incorrectly.

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Sunday, July 24th, 2016 AT 11:31 AM

GDUUUU

MEMBER
3 POSTS

It is not clogged. I was able to manually pump fuel with the pump in my hands and I double checked to make sure the pump was installed correctly.

I do not know much about being a mechanic, I am learning as I work on it.

Is the cam powered by spark plug?

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Sunday, July 24th, 2016 AT 12:23 PM

HMAC300

MECHANIC
48,601 POSTS

No there is a chain going from crankshaft to camshaft. Single arrow points to what should be rubbing on camshaft where the double arrow is I think that is suction if not it is the other side. Put your finger in front of it while turning over and see if it is sucking then see if the hose is sucking together as that may be the problem. It would be wise to put a new fuel filter prior to the pump. If you did not put new hoses on the truck then do so as they are more than likely bad and soft.

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Sunday, July 24th, 2016 AT 12:40 PM

GDUUUU

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3 POSTS

It does suck. I think you are right I should put new hoses.

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Sunday, July 24th, 2016 AT 1:27 PM

CJ MEDEVAC

MECHANIC
11,004 POSTS

Different person,

Maybe there is a hole/ crack in the suction line from the tank, especially in a turn or loop in the line.

Also maybe the sock (in the tank) is stopped up.

I am into crude testing, even if it costs a little bit.

I would get enough rubber fuel line to reach the tank and dangle on the ground to the fuel pump (just to test). You can crawl under and do the proper fix after this works.

Just being me, and kind of ignore the "correct" way, I hook hoses up and suck on them to see if I am pulling fuel (fumes and fuel are involved doing this). I reckon hooking up a hand operated vacuum pump might serve the same purpose.

The Medic