Airdog install
 

Okay...started my install on an airdog 150 last night on my 2004 Ram 2500. I dropped the tank and what a MESS! I took a bath in diesel fuel. When I pulled out the basket fuel spilt all over. I wish I had removed the bed but I didn't want to wait for help. I'll install the draw tube tonight and reinstall the tank. Here's my question. Instruction say to go from airdog to the pump on the hight pressure side and bypass the OEM fuel filter. If I bypass the fuel filter I also lose the fuel heater. Should I tap right into the factory filter in order to keep the heater? I looked it up in the manual and it says the heater keeps the fuel from waxing below 45F. I'm in Southern MD and it get below 45F here in the winter. What do you guys think?:s::s:

Got the airdog installed. The biggest problem was with the new draw tube. If your going to install a draw tube the best thing to do is to remove the bed. Its not to bad pulling the tank but putting it back in is a nighmare. Truck runs great and the airdog is completely quiet. Do to the install issues I left the factory lines installed. I removed the power plug from the OEM lift pump and caped the banjo bolt. I'll leave it for now but I'm going to have to pull the bed because now my fuel guage doesn't work.

Being in Alberta, Canada (where it gets to -40 in the winter) I ran my FASS through the factory fuel filter assembly to keep the heater. It shouldn't be needed if the fuel stations are properly mixing the winter blend, but better safe then sorry.

I'm also going to move this to the appropriate section to get more views. :tu:

The factory heater only keeps the factory filter from waxing...what does it do for the AirDog filters that are way upstream? The factory fuel heater does absolutely nothing for preventing aftermarket filters from waxing. So running the factory heater with an Airdog or FASS is pretty much a waste of time.

I'm not going to say I run a lot of cold temps, but I've put a load of miles on an unheated FASS, and now an Airdog, with temps down to -25*F (ambient) and never had a (cold weather) fuel issue. But I also treat my fuel if its going to be cold or if I travel from the southern stated into the north during winter months.

I have a Airdog and I know others that have them here in Alaska were it gets colder than -40 and we don't have any issues.

after i installed my air dog i drove a few hundred miles and my fuel gauge only works from full to just above half then it stops. i pulled the module out and plugged it in and messed with the float and watched the gauge work from empty to full so i reinstalled it now it doesnt work again. wonder if it was something i did?

Did you clock the sending unit so the float aligns with the tank? If not, it may hit the side of the tank which would prevent it from travelling its full range.

I am in agreement with Steve here....
I have MANY miles on both FASS and Airdog's with no fuel heater assemblies working and never have had any issues.I make a trip into Northern Quebec every Winter to visit a good friend and ride sleds on their farm where temps outside go into the -35f area and have not had a issue with fuel gelling at all with no heater.

Fuel gauge issues could either be something as simple as a plug issue or a issue with the float inside so if it were mine I would start easy and then move on until you fix it.On my 05 truck we draw the fuel from the tank bottom from a sump and use the factory return line as it was from Dodge and placed the AD return into where the factory lift pump used to be and not into the fuel fill tube.

FASS does offer fuel heating kits that install directly into your Heavy Duty, Titanium and the Platinum fuel systems.

yeah i marked it with a paint stick before i pulled it out. i want to say that it could only fit in there one way tho, but i could be wrong

Thanks. I bypassed the fuel heater because the temps dont get too low here in Maryland. I was just worried about bypassing a factory system. I though maybe Dodge knew something I didn't about the fuel. It was a fairly easy install for the fuel lines. Truck started right up.

I have the same issue with my fuel guage except it shows empty. When I pulled the sending unit out of the tank it got caught on the edge so I'm sure I messed it up. I read the 12Vdc goe to the sending unit through the resistor track and out puts a dc voltage between .6(FULL) and 7 volts (EMPTY). If your guage only reads to half it safe to assume your wiring is fine.

Try cleaning the connector plug on the tank (this send the 12vdc input and sends the corrosponding output voltage to the ECM) and making sure its completely seated. If you still have a problem I think you are going to have to drop the tank and look at the contacts on the resistor bank. I just dropped my tank last night and the contact on the float arm was not touching the resistor bank so I think I found my problem. I'll post some pictures of my issue so you can see how I messed this up.

Well.....the issue was the float was getting caught on the new draw tube I installed for the air dog. I installed the tube on the passanger side of the tank but when I reinstalled the tank the return line and original fuel line wouls not reach the sending unit so I remember that I loosened the cap on the assembly and rotated it untill the lines would connect. When I rotated the unit the float got caught on the new draw tube. If I had to do this again I would have spent more time planning the install location of the draw tube. I did read the input voltage and moved the float up and down and the guage did move with the float but it does have a 20-30 second delay moving the needle so that threw me off for a while. I'm going to reinstal the tank tonight and I'll only post again if I have or find another problem.

I don't belive you have a connection or wiring problem because your getting a reading. Try rotation the sending unit untill the float is clear. You may was to pull your drive shaft to give you more room. I pulled mine to replace the transfer case output seal and it makes a big difference. I will now be able to actually reach the connections on the tank.

Good luck with your fuel problem and I hope this post helps.