Refueling

[rmalik1]

Background - used to have a dually with a diesel transfer tank and now own a gas HD truck. I don't want another transfer tank and not not sure how to refuel now that I can't go through the truck stop diesel lanes. I know my new truck w/ my 5've can't make the turn if the pumps are set up facing in/out of storefront. With only 36 gallons of gas, I will need to refuel a lot than the 88 gallons of diesel I use to carry in my dually!

Reason for not getting transfer tank are weight and now we just are vacationers and maybe a snowbirds/sunbirds, so we aren't on the road nearly as much after my cancer.

[Dave_H_M]

I found out that the regular ole fuel pump (4 to 6 psi as I recall) does have a check valve in it. However it is checked for back flowing since it needs to be that way for feeding a carburetor. I found that the check valve would let the gas siphon forward since the tank filler neck is below the aux tank level. Installing a 12 volt normally closed valve in the transfer line between the pump and filler neck inlet will solve this problem. Also by shutting the fuel off that way the vehicle system automatically goes to a closed system when the pump is turned off. For me that eliminated the need for the return line.

Also there is s handy little electronic gizmo out the re that will allow you to adjust how long the fuel pump will run after it is switched on.

[fj12ryder]

You cannot use a gravity feed, the gasoline must be pumped...but it can be pumped to the filler neck of the OEM tank. Here's what I found:

"The Installer/Purchaser is responsible for acquiring fuel hoses,clamps, and an electric fuel pump to complete the installation. The gasoline auxiliary tank connects into the factory fuel system through the filler neck hose. The gasoline auxiliary tanks install similarly to the diesel ones, however, it is not legal to gravity feed out of the bottom of the auxiliary tank with gasoline. By law, the fuel must be pulled from a fitting on top of the auxiliary tank. ATI adds a pickup tube to the gas auxiliary tanks with a hose barb on the top of the tank. You must use a pump, a low volume universal fuel pump, for example, an Airtex E84070 with an on/off switch in the cab, to pull the fuel from the aux tank and pump it into the factory tank via the truck's factory filler neck hose. ATI offers the 1" ( FNA1.0 ) filler neck adapters which work with most gas trucks. These adapters have two 3/8" hose barbs; one where your fuel comes in and one where we recommend running a return line back to the auxiliary tank. On most trucks, you will also need to run another hose from the vent on the auxiliary fuel tank and "T" into the factory installed vent line that runs along with the filler neck hose. This will close the system to ensure you don't get check engine or loose gas cap SES warning lights."

Definitely a bit more convoluted than a diesel auxiliary tank. More hoops to jump through, and a bit more expensive, due to safety regulations.

[rmalik1]

Dave H M wrote:
Malik, where did you get that information? As the mods did to me please give a reference.

Not true you can pump fuel from the dip tube in the tank directly into the filler neck of the truck Prove me wrong please.

transfer flow or even look up tractor supply ...

[howtosellmyrv]

RobWNY wrote:
I use RV Trip Wizard when planning my trips and it has all the available fuel stops. Before I add one to my trip, I google Earth the station and make sure I will have the room to get in and out. Then I add the stop to my trip. It takes a lot of the guesswork out of things and makes for a more stress free traveling experience. That is until you pull into a truck stop that doesn't have a designated RV lane but plenty of room for RV's. You pull into a pump behind a 1987 rusted out Plymouth Reliant K car with a donut tire on the front passenger side and cigarette smoke billowing out both sides of the car. You assume the driver has gone into the store to pay their $7.02 bill but as time goes on, you realize they are either shopping, having lunch or decided to watch TV on the store television. So you ask the teenage passengers if someone would move the car so others don't get blown up because they aren't bright enough to not smoke at the fuel pump and it would let others get fuel. You learn that they don't speak or understand English. So you sit in your truck wondering if you can drive into the back of their car and push it out of the way without having to explain yourself to the local Law Enforcement. You decide that's not a great idea, nor would using a bunch of F bombs to voice your displeasure so you sit there P.O'd for 25 minutes. Once they leave, you get fuel and you're back on your way. You barely speak a word to your wife for the next 2 hours because you are still P.O'd. You don't lighten up until you arrive at your destination and can crack open the first of several cold beers. Oh what great times we have some days.

Rob hit it right on the head, RV trip Wizard and Google Earth is a great combination to ease your mind

[hornet28]

This is for all those who are telling Dave he's wrong.

https://www.transferflow.com/shop/fuel-tank-and-tool-box-combos?noncompat=False

It is not illegal to have a gas auxiliary tank. I do believe it's illegal to have it gravity feed though. That's not a problem just use a small electric fuel pump and T it into the vent pipe or the fill pipe

[Dave_H_M]

Malik, where did you get that information? As the mods did to me please give a reference.

Not true you can pump fuel from the dip tube in the tank directly into the filler neck of the truck Prove me wrong please.

[rmalik1]

agesilaus wrote:
When we had a gasser I just made sure to give the lot setup a good look before entering and always used the outside lanes for refueling. Seeing a big class A with a toad trying to back out of a restricted inside lane once burned that lesson in....heh.

I could be wrong but believe that you cannot buy a gasoline transfer tank for the back of your truck anyway. Diesel only.

You have to get a tank that has it own pump with gas nozzle. Not a true transfer tank thats automatic but you just stop and re-fuel yourself.

[gkainz]

Yeah, back in the 70's, I added a second, factory tank with manual switches to at least 1 Chevy and 1 Ford truck. I was pretty proud of my second addition when I figured out how to switch the sender from both tanks to the single dash gas gauge (high school student at the time).

My dad, as part of his construction company, had custom built line box beds that would transfer from old truck to new truck for the fleet of F-350s that included 2 separate tanks, one for gas and one for diesel. They weren't plumbed into the fuel system, however, and refueling required one to stop and pump from the bed tank to the truck tank.

[Dave_H_M]

Gas Tanks

If anyone is interested and wants to do one I will gladly explain how to plumb it.

[ACZL]

laknox wrote:
Many, many trucks came from the factory with a manually-switched aux tank. Many more were added aftermarket. Complete separate tank, with its own pickup and gauge. Flip a switch in the cab and it changed the pickup setting and gauge.

Lyle

Mid 80's GM's had optional dual tanks albeit saddle tanks (20 gallons each) to which I think you may be referring to. I had a '86 GMC K2500 w/ 6.2 diesel with said tanks. That 'ol gal got 18 mpgs!

[fj12ryder]

Dave H M wrote:
all you experts can have a peek here for the time being. I will post back this eve after the rain starts and add a little more enlightenment on the subject.

Our aluminum gasoline auxiliary fuel tanks for gas are built to meet and exceed Title 49 CFR 393.65 for fuel tanks. The all aluminum .125" thick HD fuel tank was specifically designed for gasoline.
Gasoline Tank Toolbox Combo
Gasoline Tank Toolbox Combo
Rectangle Gasoline Tanks
Rectangle Gasoline Tanks

That company even sells kits for transferring the gas to the filler neck. :S

A link would be very nice.,

[laknox]

Many, many trucks came from the factory with a manually-switched aux tank. Many more were added aftermarket. Complete separate tank, with its own pickup and gauge. Flip a switch in the cab and it changed the pickup setting and gauge.

Lyle

[Dave_H_M]

all you experts can have a peek here for the time being. I will post back this eve after the rain starts and add a little more enlightenment on the subject.

Our aluminum gasoline auxiliary fuel tanks for gas are built to meet and exceed Title 49 CFR 393.65 for fuel tanks. The all aluminum .125" thick HD fuel tank was specifically designed for gasoline.
Gasoline Tank Toolbox Combo
Gasoline Tank Toolbox Combo
Rectangle Gasoline Tanks
Rectangle Gasoline Tanks

That company even sells kits for transferring the gas to the filler neck. :S

[fj12ryder]

laknox wrote:


Dunno. My old '78 short bed gasser only had a 16 gal tank. I added another 16 gal aux tank on the other side, with a manual switch to change over. Worked great for me for a lotta years. Truck before that was a '74 2500 long bed. IT only had a 16 gal tank and, with 4.10 gears, even when not towing, only got about 16-17 mpg. I was in school at UC Davis and it was a 5-stop trip to from PHX to get there. That was when the limit was 55, too, so it was loooong days. With the '78, it was a 2-stop trip.

Lyle

Well, the DOT was a lot more forgiving in years past. 🙂 And as far as installing a tank out of sight like that, is possibly a whole different situation.