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09-29-2015, 06:20 PM
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#1 |
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Registered User
Join Date: Jun 2014
Location: CO
Posts: 749
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Fuel pump question 1979
So I was looking under the truck the day and noticed a random hose by the fuel pump. It is a rubber hose with electrical tape and it is bent in a U shape. I thought well maybe it is a vent hose for gas tank but there is no place for it on fuel pump. The fuel pump just has a line coming from tank and one going to carb. I looked at fuel pumps on Advance auto for a 350 and still no fuel pump with a vent provision. The rubber hose is connected to a steel line but was hard to trace back. Anyone know what the line might be and why it would just be hanging there?
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79 Chevy 2wd BIG10 350 TH400 |
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09-29-2015, 06:23 PM
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#2 |
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Registered User
Join Date: Apr 2012
Location: san diego ca
Posts: 618
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Re: Fuel pump question 1979
pictures
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09-29-2015, 07:04 PM
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#3 |
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Registered User
Join Date: May 2015
Location: Montana
Posts: 3,696
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Re: Fuel pump question 1979
Never seen a vent or return line on a mechanical fuel pump.
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Current/past Chevy/GMC trucks: 1958 Chevy C-60; 1965 GMC C-50; 1965 Chevy C-10; 1971 Chevy K-10; 1973 Chevy K-20; 1976 GMC C-20; 1977 Chevy C-10 Suburban; 1980 Chevy K-10; 1989 Chevy K1500; 1991 GMC V1500 Suburban; 2016 Chevy K2500 HD Other vehicles: 1988 Jeep XJ; 2011 Toyota 4Runner |
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09-29-2015, 07:22 PM
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#4 |
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Registered User
Join Date: Dec 2010
Location: Visalia, Ca
Posts: 707
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Re: Fuel pump question 1979
They are pretty common on mid to late 70's and 80's 4x4 with a small block my 79 k5 my 76 k10 my 75 k5 all had the return stock but my 74 k5 doesn't and neither did my 76 c10 they bumped up emissions in 79 so they probably but it on 2wd starting that year
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<Brandon> 1974 Chevrolet K5 Blazer 350sbc/SM465/NP205, dana44 front, corp 14bolt rear with 4.10s and a powertrax locker, custom rear bumper 400sbc in the works.  1981 GMC C1500 stepside 250i6, 3spd, 12bolt with 3.08s 2.5/4drop on 15x10 with 275/50r15 81 GMC C3500 cab-chassis dually with utility bed 350sbc, Sm465, 14bolt with 4.10s nv4500 getting ready to go in 1979 Chevrolet K5 R.I.P. http://67-72chevytrucks.com/vboard/s...d.php?t=434096 1976 Chevrolet C10 R.I.P. http://67-72chevytrucks.com/vboard/s...d.php?t=434195 |
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10-01-2015, 02:36 PM
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#5 |
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Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: Fuel pump question 1979
My 84 has a return line from the fuel pump to the tanks. It helps keep the gas from vaporizing in the fuel pump and vapor locking the fuel line. The return line has a small orifice to only let a small amount return to the tank.
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Frank |
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10-01-2015, 03:02 PM
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#6 |
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Registered User
Join Date: May 2015
Location: Montana
Posts: 3,696
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Re: Fuel pump question 1979
Okay, well - I never worked on my (brand new) 1980 much in the couple years that I had it, and the next newer square body that I got was a 1991 with electric pump.
Regarding the original question, then maybe the fuel pump has been replaced with a single line pump for an earlier vintage, and the loop is to plug off the return line ???
__________________
Current/past Chevy/GMC trucks: 1958 Chevy C-60; 1965 GMC C-50; 1965 Chevy C-10; 1971 Chevy K-10; 1973 Chevy K-20; 1976 GMC C-20; 1977 Chevy C-10 Suburban; 1980 Chevy K-10; 1989 Chevy K1500; 1991 GMC V1500 Suburban; 2016 Chevy K2500 HD Other vehicles: 1988 Jeep XJ; 2011 Toyota 4Runner |
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10-01-2015, 07:05 PM
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#7 | |
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Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: Fuel pump question 1979
Quote:
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Frank |
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10-06-2015, 10:32 AM
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#8 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Fuel pump question 1979
here is a couple of stock pump pics,similar discussion...
http://67-72chevytrucks.com/vboard/s...d.php?t=669573
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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10-06-2015, 06:36 PM
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#9 |
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Registered User
Join Date: Jun 2014
Location: CO
Posts: 749
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Re: Fuel pump question 1979
So since I am not planning on replacing my fuel pump anytime soon. Is it a big deal if I stick a bolt in the end of the hose and clamp it off? I always wondered why the truck smelled like gas so much. I thought it was just because it needed a carb rebuild or charcoal cannister, which I am still planning on doing the carb.
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79 Chevy 2wd BIG10 350 TH400 |
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