Blazer tank plumbing question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Wilson_ · 02-16-2010, 07:41 PM

I picked up a 78 blazer tank and will using the sender that came with it.

There is like 4 or 5 hoses connected to it. Which one do I hook the fuel pump to? Does it matter? And do I just plug the rest?

I will get a pic up tonight.

Thanks

OldCreek · 02-17-2010, 02:04 PM

My guesses:

The largest, 5/8", is probably the filler vent that runs back towards the gas cap.
There should be a 1/4" vent for the canister. It will have a ball valve just under the lid.
Two lines left: the larger, prob 3/8", is the pump feed line and the smaller, 5/16", is the return. The return should stop just after it passes through the lid and the feed should run for several inches.
If there is a fifth.....maybe its another return/vent line.

OldCreek · 02-17-2010, 02:06 PM

The feed and return lines should have rubber fittings and compression fittings.

02-16-2010, 07:41 PM	#1
Wilson_ Registered User Join Date: Sep 2008 Location: Santa Rosa, CA Posts: 451	Blazer tank plumbing question I picked up a 78 blazer tank and will using the sender that came with it. There is like 4 or 5 hoses connected to it. Which one do I hook the fuel pump to? Does it matter? And do I just plug the rest? I will get a pic up tonight. Thanks __________________ Northern California Group Met list: Cyclone, KCJones, TranzAm, extd56, hotrodhomi, mnky30, Rokcrln, Brad, JerryJones, Petey-pablo, 72Subby Last edited by Wilson_; 02-16-2010 at 07:41 PM.

02-17-2010, 02:04 PM	#2
OldCreek Registered User Join Date: Jan 2007 Location: Central Coast California Posts: 1,026	Re: Blazer tank plumbing question My guesses: The largest, 5/8", is probably the filler vent that runs back towards the gas cap. There should be a 1/4" vent for the canister. It will have a ball valve just under the lid. Two lines left: the larger, prob 3/8", is the pump feed line and the smaller, 5/16", is the return. The return should stop just after it passes through the lid and the feed should run for several inches. If there is a fifth.....maybe its another return/vent line. __________________ 1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) 2003 K2500HD 8.1/Allison1000/NP263

02-17-2010, 02:06 PM	#3
OldCreek Registered User Join Date: Jan 2007 Location: Central Coast California Posts: 1,026	Re: Blazer tank plumbing question The feed and return lines should have rubber fittings and compression fittings. __________________ 1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) 2003 K2500HD 8.1/Allison1000/NP263

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