1972 c10 1/2 ton fuel problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Popp55 · 12-26-2016, 06:55 PM

I have a 1972 chevy pickup. Still running the original motor and trans. I have replaced my electric fuel pump and sending unit 2 times. My issue is the carb is not receiving fuel from the pump but I also disconnected the in line to the fuel pump and turn the truck on and still no fuel coming from the line itself. So I can't figure out why the line isn't getting fuel in the first place. I checked the fuse area that runs to the fuel pump and it has good power, even replaced the wire to be sure there were no breaks in it. Any ideas or anybody who has had this problem?
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Popp55 · 12-26-2016, 07:01 PM

I have a 1972 chevy pickup. Still running the original motor and trans. I have replaced my electric fuel pump and sending unit 2 times. My issue is the carb is not receiving fuel from the pump but I also disconnected the in line to the fuel pump and turn the truck on and still no fuel coming from the line itself. So I can't figure out why the line isn't getting fuel in the first place. I checked the fuse area that runs to the fuel pump and it has good power, even replaced the wire to be sure there were no breaks in it. Any ideas or anybody who has had this problem?

**paul blair** · 12-26-2016, 07:52 PM

Is the fuel pump in the tank or on the frame? 12 volts to pump and good ground at the pump should make it run. If the pump is frame mounted and running, how far from tank--should be close to tank--fuel line or pick up tube clear? Good luck!

scooterpimp · 12-26-2016, 08:09 PM

Electric fuel pump? Was this an add on pump? Instead of mechanical pump on engine?

**LockDoc** · 12-26-2016, 09:30 PM

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Can you hear the electric pump running? Does that particular pump need to be primed?

If the answer to those two questions is "yes" and "no" the fuel line itself must be plugged. Remove the gas cap then remove the hose from the electric pump inlet and blow air backwards through the line. You should only need about 10 or 15 pounds of pressure..... See if that opens it up.

LockDoc

Popp55 · 04-20-2017, 04:01 AM

Clearly late update ran into bigger issues, but the simple problem was a blown fuse in a hidden relay.

**LockDoc** · 04-20-2017, 11:07 PM

Quote:

Originally Posted by Popp55

Clearly late update ran into bigger issues, but the simple problem was a blown fuse in a hidden relay.

Thanks for the followup. It's always nice to know what caused a problem even if it is an off the wall solution. Who wouldda' thunk it...

LockDooc

**leddzepp** · 04-20-2017, 11:56 PM

Quote:

Originally Posted by Popp55

Clearly late update ran into bigger issues, but the simple problem was a blown fuse in a hidden relay.

Any pics of your 72? I live in Riverside also.

El Dorado Jim · 04-21-2017, 01:15 AM

thanks for the update.

12-26-2016, 06:55 PM	#1
Popp55 Registered User Join Date: Dec 2016 Location: Riverside California Posts: 8	1972 c10 1/2 ton fuel problems I have a 1972 chevy pickup. Still running the original motor and trans. I have replaced my electric fuel pump and sending unit 2 times. My issue is the carb is not receiving fuel from the pump but I also disconnected the in line to the fuel pump and turn the truck on and still no fuel coming from the line itself. So I can't figure out why the line isn't getting fuel in the first place. I checked the fuse area that runs to the fuel pump and it has good power, even replaced the wire to be sure there were no breaks in it. Any ideas or anybody who has had this problem? Posted via Mobile Device

12-26-2016, 07:01 PM	#2
Popp55 Registered User Join Date: Dec 2016 Location: Riverside California Posts: 8	72 Chevy pickup 1/2 ton fuel problems I have a 1972 chevy pickup. Still running the original motor and trans. I have replaced my electric fuel pump and sending unit 2 times. My issue is the carb is not receiving fuel from the pump but I also disconnected the in line to the fuel pump and turn the truck on and still no fuel coming from the line itself. So I can't figure out why the line isn't getting fuel in the first place. I checked the fuse area that runs to the fuel pump and it has good power, even replaced the wire to be sure there were no breaks in it. Any ideas or anybody who has had this problem?

12-26-2016, 07:52 PM	#3
paul blair Senior Member Join Date: Jan 2016 Location: massachusetts Posts: 329	Re: 1972 c10 1/2 ton fuel problems Is the fuel pump in the tank or on the frame? 12 volts to pump and good ground at the pump should make it run. If the pump is frame mounted and running, how far from tank--should be close to tank--fuel line or pick up tube clear? Good luck!

12-26-2016, 08:09 PM	#4
scooterpimp Registered User Join Date: Dec 2015 Location: Newark ,Delaware Posts: 158	Re: 72 Chevy pickup 1/2 ton fuel problems Electric fuel pump? Was this an add on pump? Instead of mechanical pump on engine?

12-26-2016, 09:30 PM	#5
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,772	Re: 1972 c10 1/2 ton fuel problems - Can you hear the electric pump running? Does that particular pump need to be primed? If the answer to those two questions is "yes" and "no" the fuel line itself must be plugged. Remove the gas cap then remove the hose from the electric pump inlet and blow air backwards through the line. You should only need about 10 or 15 pounds of pressure..... See if that opens it up. LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -

04-20-2017, 04:01 AM	#6
Popp55 Registered User Join Date: Dec 2016 Location: Riverside California Posts: 8	Re: 1972 c10 1/2 ton fuel problems Clearly late update ran into bigger issues, but the simple problem was a blown fuse in a hidden relay.

04-21-2017, 01:15 AM	#9
El Dorado Jim Registered User Join Date: Dec 2009 Location: El Dorado Ca Posts: 3,374	Re: 1972 c10 1/2 ton fuel problems thanks for the update.



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