1985 C/10 gas tank question... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

65standard · 11-26-2015, 05:04 PM

I have an '85 C/10 short bed with 305 and turbo 350 trans now. Plan is to swap in the 6.0 LSx and 4L80 trans I have. My question is can I use the stock '85 tank with the '87 sending unit with pump upgrade. Or do I really need to use the '87 tank in order to use the '87 sending unit?

ls1nova71 · 11-26-2015, 05:20 PM

You can use your tank, but it won't have any baffling in it so when you get low on fuel it WILL run away from the pump at some point and will cause the engine to stumble, usually during acceleration when you don't want that to happen.

65standard · 11-26-2015, 06:17 PM

Thanks for the info. When I looked at a new 1987 C/10 16 gallon tank, it said baffling not included. Can I assume that not all 1987 C/10 tanks were EFI tanks? I know the my '87 Monte Carlo was originally carbureted.

Can I use the fuel pump from my LSx donor truck on the 1987 C/10 sending unit? Or maybe use the whole LSx donor truck's sending unit on a new 1987 tank?

11-26-2015, 05:04 PM	#1
65standard Registered User Join Date: Dec 2014 Location: Coal City, IL Posts: 695	1985 C/10 gas tank question... I have an '85 C/10 short bed with 305 and turbo 350 trans now. Plan is to swap in the 6.0 LSx and 4L80 trans I have. My question is can I use the stock '85 tank with the '87 sending unit with pump upgrade. Or do I really need to use the '87 tank in order to use the '87 sending unit? __________________ Tony Nicholas @ Midwest Metal Masters 1953 Chevy 3100 392 Hemi w/727 & 9” Ford 1985 Chevy C/10 6.0L 4L80 373 locker

11-26-2015, 05:20 PM	#2
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: 1985 C/10 gas tank question... You can use your tank, but it won't have any baffling in it so when you get low on fuel it WILL run away from the pump at some point and will cause the engine to stumble, usually during acceleration when you don't want that to happen. __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

11-26-2015, 06:17 PM	#3
65standard Registered User Join Date: Dec 2014 Location: Coal City, IL Posts: 695	Re: 1985 C/10 gas tank question... Thanks for the info. When I looked at a new 1987 C/10 16 gallon tank, it said baffling not included. Can I assume that not all 1987 C/10 tanks were EFI tanks? I know the my '87 Monte Carlo was originally carbureted. Can I use the fuel pump from my LSx donor truck on the 1987 C/10 sending unit? Or maybe use the whole LSx donor truck's sending unit on a new 1987 tank? __________________ Tony Nicholas @ Midwest Metal Masters 1953 Chevy 3100 392 Hemi w/727 & 9” Ford 1985 Chevy C/10 6.0L 4L80 373 locker

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