Moved gas tank on the 42 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dennislbrooks · 10-25-2025, 07:53 AM

I am sure there are other ways of doing this, but I removed the stock under seat tank to lower my seat 1.75" - creature comfort. I use a Caravan 2nd seat. I still have a dummy fill on passenger side cab - cannot be used.

I purchase a stock 1990 Blazer 20 gallon tank and placed behind the rear axle. I am guessing but it seems to me these may have been used mainly on 4WD models - dunno. I moved it forward so as not to notice it because I do not use a bumper apron.

It is an EFI tank and sender, however I do not plan on putting EFI on it. I run a Holley inline to feed my 1406 with fuel filters on both sides of the pump. I had never run a mechanical pump as there was inadequate frame room on my S-10 frame.

I used the return port for the pump feed and the tank vent to vent. Plugged the fill vent and the in-tank pump port. The in-tank pump electric feed is capped and shrank. I ran the float gauge wire to the dash and grounded the tank well.

I still need to place the in-bed fill when I get the 2 inch hose.

The Dolphin fuel sender and gauge are 0 ohms empty and 90 ohms full.

I will see what works soon.

dennislbrooks · 10-25-2025, 07:55 AM

More pics

**3757chevy** · 11-23-2025, 07:06 PM

Looks good. Hope everything works like you planned.

dennislbrooks · 11-24-2025, 02:36 PM

Seems good.. There is no problem pulling thru the return port (5/16") with the inline Holley pump. The electric pump is about halfway between the engine and the tank and is below the fuel tank. The sender for the 1990 20 gallon S10 Blazer tank works great and reflects the proper amount on the Dolphin gauge and does not dance around. I did not use the in tank pump at all but I did bring out a 3/8 inch rubber line which is plugged off.

I did have to thread the resonators and exhaust pipe to exit the body behind the rear axle.

**3757chevy** · 11-24-2025, 06:27 PM

Quote:

Originally Posted by dennislbrooks

Seems good.. There is no problem pulling thru the return port (5/16") with the inline Holley pump. The electric pump is about halfway between the engine and the tank and is below the fuel tank. The sender for the 1990 20 gallon S10 Blazer tank works great and reflects the proper amount on the Dolphin gauge and does not dance around. I did not use the in tank pump at all but I did bring out a 3/8 inch rubber line which is plugged off.

I did have to thread the resonators and exhaust pipe to exit the body behind the rear axle.

Nice, exhaust looks great.

10-25-2025, 07:53 AM	#1
dennislbrooks Registered User Join Date: Feb 2004 Location: Williamsburg, Ohio Posts: 1,886	Moved gas tank on the 42 I am sure there are other ways of doing this, but I removed the stock under seat tank to lower my seat 1.75" - creature comfort. I use a Caravan 2nd seat. I still have a dummy fill on passenger side cab - cannot be used. I purchase a stock 1990 Blazer 20 gallon tank and placed behind the rear axle. I am guessing but it seems to me these may have been used mainly on 4WD models - dunno. I moved it forward so as not to notice it because I do not use a bumper apron. It is an EFI tank and sender, however I do not plan on putting EFI on it. I run a Holley inline to feed my 1406 with fuel filters on both sides of the pump. I had never run a mechanical pump as there was inadequate frame room on my S-10 frame. I used the return port for the pump feed and the tank vent to vent. Plugged the fill vent and the in-tank pump port. The in-tank pump electric feed is capped and shrank. I ran the float gauge wire to the dash and grounded the tank well. I still need to place the in-bed fill when I get the 2 inch hose. The Dolphin fuel sender and gauge are 0 ohms empty and 90 ohms full. I will see what works soon. Attached Images __________________ 1942 Chevy 1/2-ton Rod, 1959 GMC 1/2 ton Fleet Step side, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T, 2018 Bolt Last edited by dennislbrooks; 10-26-2025 at 01:07 PM. Reason: words

10-25-2025, 07:55 AM	#2
dennislbrooks Registered User Join Date: Feb 2004 Location: Williamsburg, Ohio Posts: 1,886	Re: Moved gas tank on the 42 More pics Attached Images __________________ 1942 Chevy 1/2-ton Rod, 1959 GMC 1/2 ton Fleet Step side, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T, 2018 Bolt

11-23-2025, 07:06 PM	#3
3757chevy Senior Member Join Date: Mar 2016 Location: Near Canon City ,Colorado Posts: 4,495	Re: Moved gas tank on the 42 Looks good. Hope everything works like you planned. __________________ '35 1/2 ton Pickup (bought 2020) '68 C10 Suburban (bought 2021) '72 K5 Blazer (bought 2013) '67 Stepside (bought 1997-sold 2021-partially bought back 2024) '96 Bronco Eddie Bauer (inherited 2010) My 1st day here-'67 C10(sold)and '72 K5 Blazer http://67-72chevytrucks.com/vboard/s...d.php?t=702056 "Another Blue Chevy"(1935) http://67-72chevytrucks.com/vboard/s...d.php?t=799203 '68 Burb...https://67-72chevytrucks.com/vboard/...d.php?t=822994 MIKE

11-24-2025, 02:36 PM	#4
dennislbrooks Registered User Join Date: Feb 2004 Location: Williamsburg, Ohio Posts: 1,886	Re: Moved gas tank on the 42 Seems good.. There is no problem pulling thru the return port (5/16") with the inline Holley pump. The electric pump is about halfway between the engine and the tank and is below the fuel tank. The sender for the 1990 20 gallon S10 Blazer tank works great and reflects the proper amount on the Dolphin gauge and does not dance around. I did not use the in tank pump at all but I did bring out a 3/8 inch rubber line which is plugged off. I did have to thread the resonators and exhaust pipe to exit the body behind the rear axle. Attached Images __________________ 1942 Chevy 1/2-ton Rod, 1959 GMC 1/2 ton Fleet Step side, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T, 2018 Bolt Last edited by dennislbrooks; 11-24-2025 at 02:48 PM. Reason: pics



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