Gravity fed Fuel tank

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Randy Grant

Senior Member
Military
Joined
Feb 14, 2019
Posts
508
Reaction score
564
Location
Ellensburg, WA 98926
Ram Year
2019
Engine
Hemi 5.7
Along with direct feed being unlawful, it is ill advised. Most fuel systems are now closed, and a gravity feed may cause issues and throw codes along with other issues. A transfer system as foolproof and far safer. Another thing to consider is that underground/covered parking structures may prohibit in bed fuel tanks, especially in federal sites, as I fould out when parking at Hoover Dam. Had to park outside parking.
 

bigblock_doc

Junior Member
Joined
Jun 26, 2020
Posts
10
Reaction score
3
Location
Westland, mi
Ram Year
2019
Engine
cummins
What about tanks in a race car? Most are bottom feeders. Plastic and metal. Semi tanks have a crossover on the bottom so fuel
flows evenly out of both. Only one tank feed the pump.
 

GTyankee

Senior Member
Supporting Member
Military
Joined
Nov 2, 2020
Posts
8,090
Reaction score
9,593
Location
El Cajon Calif. 92021
Ram Year
2016
Engine
3.0 ecodiesel
Before i bought my 2016 Ram Ecodiesel
I ran a 2009 Ram 5.7L, it had a 32 gallon tank
I needed to be able to drive 700 miles a day
so i installed this 30 gallon aux. tank & i carried 3 plastic tanks that held 6 gallons each

When i started out in the morning to do a long distance drive, i had about 80 gallons of gasoline in that Ram.

6auh.jpg ejck.jpg



wjac.jpg

img0888z.jpg
 

chri5k

Senior Member
Supporting Member
Joined
May 24, 2019
Posts
1,639
Reaction score
2,297
Location
USA
Ram Year
2016
Engine
Diesel
Not to start an argument, and I know a lot of people do it and some tank manufacturers allow for it, but gravity feeding from an aux tank is illegal... From one tank manufacturer's website:

Gravity Feeding is Illegal
Here are some laws (regulations) which pertain to gravity feed fuel tanks, and why they are illegal.

  1. 49 CFR CH.III (393.65) 6d; Gravity or siphon feeding is prohibited.
  2. 49 CFR CH.III (393.67) 7.4.5.; Fuel withdrawal fittings. The fittings through which fuel is withdrawn from a tank must be located above the normal level of fuel in the tank when the tank is full.
  3. In other words, the fuel must come from the top of the tank and not from a fitting on the bottom. For safety reasons, all aluminum tanks manufactured by ATTA will have no fittings on the bottom. When in doubt, look at your factory tank.

Can we not start this incorrect narrative again? That section of the CFR only applies to COMMERCIAL trucks. The OP did not say anything about commercial service.
 
Top