The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 09-27-2018, 08:11 PM   #1
Nickelcharlie
Registered User
 
Join Date: Sep 2016
Location: Cleburne, Texas
Posts: 75
No Fuel to the carburetor!

I have an 86 GMC short bed with dual tanks and I am not getting fuel to the carb.
Is there anything from the tanks that can prevent glass flowing to the fuel pump on the block? If not then the fuel pump must be bad, right?

When the switch on the dash for dual tanks is pushed in at the top which tank, right or left, is supplying gas? Thanks

Last edited by Nickelcharlie; 09-27-2018 at 08:23 PM.
Nickelcharlie is offline   Reply With Quote
Old 09-27-2018, 10:31 PM   #2
100%Chevy
Registered User
 
Join Date: Jun 2008
Location: Moss Point,Ms.
Posts: 1,439
Re: No Fuel to the carburetor!

Top is usually the right tank.
Turn the ignition on and listen for the valve to move when you push the switch.Look to see if the guage is moving too.
Sometimes it won't move far enough,the guage won't move and you get no gas from either tank.
Valve may be clogged up or bad and the sock in the tank may be clogged up.
And,it's possible the fuse is bad=no power to switch.
Working on mine today.
Mike.
100%Chevy is offline   Reply With Quote
Old 09-28-2018, 08:50 AM   #3
jwilson645
Registered User
 
Join Date: Dec 2011
Location: Morris, Alabama
Posts: 177
Re: No Fuel to the carburetor!

Quote:
Originally Posted by Nickelcharlie View Post
I have an 86 GMC short bed with dual tanks and I am not getting fuel to the carb.
Is there anything from the tanks that can prevent glass flowing to the fuel pump on the block? If not then the fuel pump must be bad, right?

When the switch on the dash for dual tanks is pushed in at the top which tank, right or left, is supplying gas? Thanks

There is a filter on the end of the fuel pickup tube in the tank. If it has never been replaced then it can likely be your problem. They will come apart, especially with ethynol fuel.

I just went through this with mine. The filter came apart and clogged up my filter and some even got by and into my carb. I dropped the tank and replaced the in tank filter.
jwilson645 is offline   Reply With Quote
Old 09-28-2018, 09:06 AM   #4
blazer2007
Registered User
 
Join Date: Jan 2007
Location: vernon b.c.
Posts: 3,019
Re: No Fuel to the carburetor!

I had a small crack in the hose at the tank where it bent up and over. It would suck air but would,t leak .Found it after I bought a new fuel pump
blazer2007 is offline   Reply With Quote
Old 09-28-2018, 10:07 AM   #5
Dead Parrot
Registered User
 
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,461
Re: No Fuel to the carburetor!

Mice will sometimes nibble on the suction hoses on the tank tops. Guessing old hoses + ethanol was enough of an attraction. Got both of mine within days of each other. Have seen forum pics of rusted out sending unit tops that let air it.

Old hoses can crumble and let air in.

As a test, pull the hose(s) from the input side of the switch valve and connect direct to the frame pipes.

Don't forget the suction line from the frame to the fuel pump.

On my 75, in on the switch top is right tank.
Dead Parrot is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 12:56 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com