need help with my truck! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

blue74chevy · 02-22-2009, 10:13 PM

A couple of weeks ago I started my truck and it ran for about a minute and then it slowly died. I tried to start it again and it was not getting any fuel to the carb, So I finally got to replace the fuel pump today and it was still not getting any gas after many times of trying to start it, it has dual tanks so I checked the valve and accidenly broke it so I replaced it and it still will not start. Any ideas?
it is a 74 k20 with a mechanical fuel pump

f.monroe · 02-22-2009, 10:28 PM

Assuming you have a stock quadrajet carb and fuel line , Sounds like the fuel filter is clogged . Take the fuel line loose at the carb and turn the engine over . Point the line into an empty plastic bottle and see if you have fuel to that point . If so the in carb filter is clogged or the needle and seat is stuck .If you do not get any fuel flow with the line disconnected , you need to look at the rubber lines from the tank to the hard lines . Mine dryrotted and started sucking air . That was on a daily driver . They just had gotten old .
Frank

blue74chevy · 02-23-2009, 12:59 AM

It is a 4bbl edelbrock it has a clear fuel filter so yo can see when the gas starts pumping, The lines look ok and it was getting gas to valve under the truck when I replaced it

blue74chevy · 02-23-2009, 02:05 PM

if I need to replace the rubber fuel lines under the truck do I need to drop the tanks to replace them?

Restrorob · 02-23-2009, 06:10 PM

Either drop the tanks or un-bolt the bed and raise it, Since you are dealing with two raising the bed may be easer.

02-22-2009, 10:13 PM	#1
blue74chevy Registered User Join Date: Nov 2008 Location: Salem, Oregon Posts: 28	need help with my truck! A couple of weeks ago I started my truck and it ran for about a minute and then it slowly died. I tried to start it again and it was not getting any fuel to the carb, So I finally got to replace the fuel pump today and it was still not getting any gas after many times of trying to start it, it has dual tanks so I checked the valve and accidenly broke it so I replaced it and it still will not start. Any ideas? it is a 74 k20 with a mechanical fuel pump

02-22-2009, 10:28 PM	#2
f.monroe Senior Member Join Date: May 2004 Location: Caldwell,Tx. Posts: 3,648	Re: need help with my truck! Assuming you have a stock quadrajet carb and fuel line , Sounds like the fuel filter is clogged . Take the fuel line loose at the carb and turn the engine over . Point the line into an empty plastic bottle and see if you have fuel to that point . If so the in carb filter is clogged or the needle and seat is stuck .If you do not get any fuel flow with the line disconnected , you need to look at the rubber lines from the tank to the hard lines . Mine dryrotted and started sucking air . That was on a daily driver . They just had gotten old . Frank __________________ Born and proudly residing in a Red State !

02-23-2009, 12:59 AM	#3
blue74chevy Registered User Join Date: Nov 2008 Location: Salem, Oregon Posts: 28	Re: need help with my truck! It is a 4bbl edelbrock it has a clear fuel filter so yo can see when the gas starts pumping, The lines look ok and it was getting gas to valve under the truck when I replaced it

02-23-2009, 02:05 PM	#4
blue74chevy Registered User Join Date: Nov 2008 Location: Salem, Oregon Posts: 28	Re: need help with my truck! if I need to replace the rubber fuel lines under the truck do I need to drop the tanks to replace them?

02-23-2009, 06:10 PM	#5
Restrorob The One And Only !!! Join Date: Jan 2007 Location: Hole in the woods Florida Posts: 4,567	Re: need help with my truck! Either drop the tanks or un-bolt the bed and raise it, Since you are dealing with two raising the bed may be easer. __________________ 93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz ! The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. *"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!* Last edited by Restrorob; 02-23-2009 at 06:13 PM.



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