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No fuel to carburetor
#1
I own a 1972 Mustang and over the last 2 years did various fixes and modifications. These included getting the heads refurbished to fix a hairline crack, adding an Edelbrock Performance Intake Manifold, Edelbrock Thunder Series 650cfm carburetor with electric choke, and a new Precision mechanical fuel pump. I am starting the car for the first time in 2 years now and the car cranks strong but no fuel is entering the carburetor, or even the fuel line going from the pump to the filter. When I replaced the old pump today and disconnected the rubber fuel line going to the tank some fuel came out of the hose but not a lot. I’m honestly stumped on why the car isn’t starting. It has about 5 gallons of new fuel in the tank, all of the vacuums are hooked up or blocked to the best of my knowledge. The only thing that isn’t attached is the positive wire of the electric choke as I am still not sure where to hook that up to. Any ideas on what could be preventing my car from starting? I’d appreciate any help!
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#2
It could be a bad fuel pump! Do you have any starter fluid? I would start there to see if you get it running enough to pressurize the fuel system. The starter fluid would also help to make sure the engine is firing.

Thanks,
mustang7173 Thankyouyellow

"Courage is being scared to death but saddling up anyway" -- John Wayne
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#3
Do you use non-ethanol fuel? If you have fuel with ethanol and you leave it sitting for a while it can go bad and clog something. They make a stabilizer for it for people who have equipment sitting during the winter or something.

If it's an old tank you might have a clogged sock from corrosion too. So for me that'd be where I'd look if you've taken the hose off at the tank and you didn't get much fuel flow.
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#4
Pour a little gas in the bowl vents of the carb until it'll shoot gas out the accelerator pump nozzles. It should run enough to pull fuel from the tank and fill the carb. You might need to do it a couple times. If not, take the inlet hose off the pump and run one from a small can of gas to the pump. That'll tell you if the pump is good or not.


[+] 1 user Likes Hemikiller's post
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#5
The fuel lines can get plugged with varnish from sitting with fuel drying out in them, unless they were blown out after it was last run. Old rubber fuel hoses can collapse internally plugging them. Any varnish, rust, or other gunk will quickly plug the inlet valve in the pump. It just takes a pin hole in the rubber or steel lines, or a slightly loose connection, to allow air into the line, which the pump will pull instead of gasoline.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#6
My starting drill for an engine that has been sitting is to fill the carb through the vent tubes, and have a rag soaked in clean gas (and mostly rung out) in hand over the carb. By squeezing it, you can get some fuel to keep it running for a few seconds even after the bowls run dry. If it isn't pumping gas by then use an external tank to test the pump. If pump is bad replace, if pump is good, blow out the fuel line and if fuel doesn't start flowing, you'll need to drain the tank and inspect the sending unit/pick up and lines.

Ethanol is nasty stuff. Carb may need a good cleaning

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#7
Was the pump installed making sure the pump arm was properly situated on the cam lobe? I'm sure you checked that, but worth mentioning.

I learn something new every day!
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#8
if u feel the line might be plugged... remove the line from fuel pump.. REMOVE gas cap and use compressor to blow into tank.. u will hear it.. please make sure u remove the cap for if u don't u just might get sprayed with gas. then rehook and drop some gas down the carb and start it.
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#9
(09-10-2019, 01:33 AM)mustang7173 Wrote: It could be a bad fuel pump! Do you have any starter fluid? I would start there to see if you get it running enough to pressurize the fuel system. The starter fluid would also help to make sure the engine is firing.

Yeah i thought it was a bad fuel pump and so i replaced it yesterday with just another mechanical fuel pump from O'Reillys. I used starter fluid before when the old fuel pump was in and the car wanted to start and then would seemingly blow some of the starter fluid out of the carburetor..
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#10
(09-10-2019, 02:19 AM)DeathWobble Wrote: Do you use non-ethanol fuel? If you have fuel with ethanol and you leave it sitting for a while it can go bad and clog something. They make a stabilizer for it for people who have equipment sitting during the winter or something.

If it's an old tank you might have a clogged sock from corrosion too. So for me that'd be where I'd look if you've taken the hose off at the tank and you didn't get much fuel flow.

I just used 87 octane pump gas from Safeway fuel.
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