Adding a Transfer Flow Fuel Tank
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Mountain Pass
Joined: Sep 2008
Posts: 129
Likes: 66
From: Coastal VA
Adding a Transfer Flow Fuel Tank
I'm considering replacing the 34-gallon F350's fuel tank with a 58-gallon tank from Transfer Flow. Can anyone comment on whether this change will void any or all of the Ford factory warranty?
Lead Driver
Joined: Nov 2005
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It could affect the fuel system warranty, and I suppose they could make a case for things attached to the fuel system.
But, I haven't heard of anyone having any warranty issue.
I doubt they would even pay any attention to the larger tank if you have to bring the truck in for warranty work, unless it is fuel tank related work.
But, I haven't heard of anyone having any warranty issue.
I doubt they would even pay any attention to the larger tank if you have to bring the truck in for warranty work, unless it is fuel tank related work.
Cargo Master
Joined: Oct 2011
Posts: 2,877
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From: SoCal/Wyoming
No, it will not void anything because it does not supply fuel directly to the engine. All it does is transfer fuel from the aux tank into the main tank. That's like saying that using a gas can would void your warranty. The only thing you need to consider is if the area you live in allows gravity feed fuel transfer. As some don't, you need to install a fuel pump that will pump the fuel from the aux tank into the main tank. I ran a 91 gallon in my 2002 for 15 years or so. I started out with gravity feed and after a few years, switched over to a holley fuel pump mounted in the bed with a switch on the dash.
Tuned
Joined: Aug 2024
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No, it will not void anything because it does not supply fuel directly to the engine. All it does is transfer fuel from the aux tank into the main tank. That's like saying that using a gas can would void your warranty. The only thing you need to consider is if the area you live in allows gravity feed fuel transfer. As some don't, you need to install a fuel pump that will pump the fuel from the aux tank into the main tank. I ran a 91 gallon in my 2002 for 15 years or so. I started out with gravity feed and after a few years, switched over to a holley fuel pump mounted in the bed with a switch on the dash.
OP- you running a gasser or oil burner?
Lead Driver
Joined: Nov 2005
Posts: 8,459
Likes: 4,955
No, it will not void anything because it does not supply fuel directly to the engine. All it does is transfer fuel from the aux tank into the main tank. That's like saying that using a gas can would void your warranty. The only thing you need to consider is if the area you live in allows gravity feed fuel transfer. As some don't, you need to install a fuel pump that will pump the fuel from the aux tank into the main tank. I ran a 91 gallon in my 2002 for 15 years or so. I started out with gravity feed and after a few years, switched over to a holley fuel pump mounted in the bed with a switch on the dash.
Cargo Master
Joined: Oct 2011
Posts: 2,877
Likes: 770
From: SoCal/Wyoming
Sorry, I see transfer tank and went with it. In regard to replacing your stock tank, it appears thousands have done it and no reported problems with a warranty issue reported so far from what I have seen.
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Mountain Pass
Joined: Sep 2008
Posts: 129
Likes: 66
From: Coastal VA
7.3L gasser. Considering replacing the small-ish factory tank with a larger aftermarket fuel tank
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Logistics Pro
Joined: Jan 2010
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I'm pretty sure you're correct, you cannot have any gravity transfer tanks on a gasser. I'm not sure pump ones are allowed either, unless it requires you to actually get out of the vehicle to pump the fuel from the aux tank to the main tank. Something about gasoline being more volatile than diesel is.
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