Quick fuel pump question... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

texascowboy593 · 03-31-2006, 10:44 PM

OK I just replaced my fuel pump on my 67 gmc w/ a 305. Was a 2 line pump and I replaced it w/ a 3 line pump. I was told at the auto parts store which was what and to cap the smaller line. As Im writing this I think I know why my carb was flooding like the Titanic. It was covered in gas. The smaller line is the return line? If so where does it hook to? thx yall!

Mechdawg · 03-31-2006, 10:47 PM

I dont think the 67-72 trucks had a fuel return line on them at least I know my 67 dosnt and my 70 didnt have one either.

JimKshortstep4x4 · 04-01-2006, 06:28 AM

72 trucks with AC used a return line fuel pump and the return line connected to the sending unit which has two tubes in it. (One for the return the other for the fuel feed line).

There may be other models of the 72 truck that used the two line sending unit as Chevy Duty (Classic Parts of America) lists the unit for 72 V-8's with auto transmission.

Jim

BLACK AND BLUE 67-72 · 04-02-2006, 04:08 PM

I would go back to the parts store and tell them you want the right pump. There are 3 versions of that pump for the 305 two with 2 lines that are almost identical other than the mounting holes are different sizes, and the other pump has three lines. If I was at work I could give you the Carter #'s for all of the pumps.

03-31-2006, 10:44 PM	#1
texascowboy593 Registered User Join Date: Dec 2004 Location: Southeast Tx Posts: 1,302	Quick fuel pump question... OK I just replaced my fuel pump on my 67 gmc w/ a 305. Was a 2 line pump and I replaced it w/ a 3 line pump. I was told at the auto parts store which was what and to cap the smaller line. As Im writing this I think I know why my carb was flooding like the Titanic. It was covered in gas. The smaller line is the return line? If so where does it hook to? thx yall! __________________ "The rays of light thru the Shiner Bock bottle make me wanna turn the key and put down the throttle...and get lost down 35" - Jason Boland www.YouTube.com/user/593Films - Watch My Videos! 1977 Silverado K10 2014 Dodge Durango (Wife-mobile) 2008 Dodge Ram Lone Star Edition (Daily driver)

03-31-2006, 10:47 PM	#2
Mechdawg Registered User Join Date: Jul 2002 Location: Dover AFB Delaware Posts: 159	Re: Quick fuel pump question... I dont think the 67-72 trucks had a fuel return line on them at least I know my 67 dosnt and my 70 didnt have one either.

04-01-2006, 06:28 AM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Quick fuel pump question... 72 trucks with AC used a return line fuel pump and the return line connected to the sending unit which has two tubes in it. (One for the return the other for the fuel feed line). There may be other models of the 72 truck that used the two line sending unit as Chevy Duty (Classic Parts of America) lists the unit for 72 V-8's with auto transmission. Jim

04-02-2006, 04:08 PM	#4
BLACK AND BLUE 67-72 Firefighter Join Date: Feb 2001 Location: Yellville, Ar, USA Posts: 1,943	Re: Quick fuel pump question... I would go back to the parts store and tell them you want the right pump. There are 3 versions of that pump for the 305 two with 2 lines that are almost identical other than the mounting holes are different sizes, and the other pump has three lines. If I was at work I could give you the Carter #'s for all of the pumps. __________________ '72 Chevy SWB 350 Auto '67 GMC LWB 350 4 speed '70 Chevy 4x4 Stepside 350 Auto Yellville, Ar. USA

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