problem with fuel or carb set up - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**phase_one** · 12-19-2006, 11:46 AM

I recently switched from points to a HEI dist. I have a 250 and used the info off of this board. It went well except i can't get the truck to run If i poor gas in the carb it will start up and run until the gas is used up. I thought of a fuel line problem. I took the tank out and used my air compresser to clean out the fuel line, sending unit and fuel pump, I even replaced the fuel filter. The carb was a rebuild from auto zone and worked when I installed it. The problem is there is no fuel when the gas pedel is pressed. Is the change from points to HEI affecting the vacum lines? Any help would be appreciated.

cdowns · 12-19-2006, 02:02 PM

disconnect fuel ine from carb crank over engine see if its pumping gas if not// you might have an empty fuel tank OR bad fuel pump OR clogged or broken fuel line check under the pass side cab theres a short piece of rubber hose it may be dryrotted and or kinked

sneakysnake · 12-19-2006, 02:04 PM

The HEI swap should'nt have had any effect on the fuel and if it will run when you pour gas in the carb, I'd pull the line loose at the carb and see if fuel is making to there, if so then you have a float problem in the carb otherwise I'd say replace the fuel pump.

**phase_one** · 12-20-2006, 06:24 PM

How would I know if the fuel sending unit isn't sending fuel to the fuel pump?

*rage'nrat638* · 12-20-2006, 07:07 PM

the fuel tank sending unit just reads the fuel level in the tank..and the voltage is read at the fuel gauge in your dash...has nothing to do with your carb not getting gas...hope you get it worked out

corn · 12-20-2006, 08:10 PM

Does it by chance have an electric fuel pump that got disconnected when you hooked up the distributor?

FarmTruk · 12-20-2006, 10:52 PM

I'd say probably...
1...bad rebuilt carb. Float stuck at top.
2...bad fuel pump.

I've had both issues happen to my stuff in the past. Luckily, they did not happen at the same time.

If by chance there is an electric fuel pump there, compressed air "should" not make it to the fuel tank, as there is a check valve in most I've seen that will prevent backflow. Did you hear the air "gurgling" in the tank?

**phase_one** · 12-21-2006, 01:42 PM

It is a mechanical fuel pump. the pump is not working. I will replace and see where i stand.

**phase_one** · 12-21-2006, 04:32 PM

The fuel pump was bad cranked right off. Thanks for the help.

12-19-2006, 11:46 AM	#1
phase_one Registered User Join Date: Jul 2001 Location: Praireville. LA 70769 Posts: 390	problem with fuel or carb set up I recently switched from points to a HEI dist. I have a 250 and used the info off of this board. It went well except i can't get the truck to run If i poor gas in the carb it will start up and run until the gas is used up. I thought of a fuel line problem. I took the tank out and used my air compresser to clean out the fuel line, sending unit and fuel pump, I even replaced the fuel filter. The carb was a rebuild from auto zone and worked when I installed it. The problem is there is no fuel when the gas pedel is pressed. Is the change from points to HEI affecting the vacum lines? Any help would be appreciated. __________________ 11 Surbaban 70 C 10 still in progress

12-19-2006, 02:02 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: problem with fuel or carb set up disconnect fuel ine from carb crank over engine see if its pumping gas if not// you might have an empty fuel tank OR bad fuel pump OR clogged or broken fuel line check under the pass side cab theres a short piece of rubber hose it may be dryrotted and or kinked __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

12-19-2006, 02:04 PM	#3
sneakysnake It's a catastrophic success. Join Date: Jan 2003 Location: Oklahoma Posts: 2,077	Re: problem with fuel or carb set up The HEI swap should'nt have had any effect on the fuel and if it will run when you pour gas in the carb, I'd pull the line loose at the carb and see if fuel is making to there, if so then you have a float problem in the carb otherwise I'd say replace the fuel pump.

12-20-2006, 06:24 PM	#4
phase_one Registered User Join Date: Jul 2001 Location: Praireville. LA 70769 Posts: 390	Re: problem with fuel or carb set up How would I know if the fuel sending unit isn't sending fuel to the fuel pump? __________________ 11 Surbaban 70 C 10 still in progress

12-20-2006, 07:07 PM	#5
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: problem with fuel or carb set up the fuel tank sending unit just reads the fuel level in the tank..and the voltage is read at the fuel gauge in your dash...has nothing to do with your carb not getting gas...hope you get it worked out

12-20-2006, 08:10 PM	#6
corn Registered User Join Date: Dec 2003 Location: here Posts: 5,789	Re: problem with fuel or carb set up Does it by chance have an electric fuel pump that got disconnected when you hooked up the distributor?

12-20-2006, 10:52 PM	#7
FarmTruk In Memoriam... Join Date: Nov 2006 Location: Wallburg, NC Posts: 1,216	Re: problem with fuel or carb set up I'd say probably... 1...bad rebuilt carb. Float stuck at top. 2...bad fuel pump. I've had both issues happen to my stuff in the past. Luckily, they did not happen at the same time. If by chance there is an electric fuel pump there, compressed air "should" not make it to the fuel tank, as there is a check valve in most I've seen that will prevent backflow. Did you hear the air "gurgling" in the tank? __________________ '68 C10 SWB 307ci 2BBL *FarmTruk Pics Here* *"You know, doing what is right is easy. The problem is knowing what is right."*

12-21-2006, 01:42 PM	#8
phase_one Registered User Join Date: Jul 2001 Location: Praireville. LA 70769 Posts: 390	Re: problem with fuel or carb set up It is a mechanical fuel pump. the pump is not working. I will replace and see where i stand. __________________ 11 Surbaban 70 C 10 still in progress

12-21-2006, 04:32 PM	#9
phase_one Registered User Join Date: Jul 2001 Location: Praireville. LA 70769 Posts: 390	Re: problem with fuel or carb set up The fuel pump was bad cranked right off. Thanks for the help. __________________ 11 Surbaban 70 C 10 still in progress

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