So I finally got my FASS 150/150 that I've been waiting on for 3 weeks. The install wasn't to bad at all. But instruction aren't the greatest but thank god I know a little. Let me tell you the FASS is really QUIET! Dunno if they changed the pump or what cause my buddies is alot louder then mine.

But my question was I installed FASS pick up kit. I went from the fuel pump main line T into the pick up kit and then to the FASS. So if I put a on/off switch on the FASS to turn it off and on can the stock fuel pump, pump thur the FASS? The reason why I'm asking is cause if I ever have a problem with the 1/4 tank problem then I can turn off the FASS and just us my stock fuel pump to get to the gas station or where ever.

Any help guys?

Thanks,
Vince

So I finally got my FASS 150/150 that I've been waiting on for 3 weeks. The install wasn't to bad at all. But instruction aren't the greatest but thank god I know a little. Let me tell you the FASS is really QUIET! Dunno if they changed the pump or what cause my buddies is alot louder then mine.

But my question was I installed FASS pick up kit. I went from the fuel pump main line T into the pick up kit and then to the FASS. So if I put a on/off switch on the FASS to turn it off and on can the stock fuel pump, pump thur the FASS? The reason why I'm asking is cause if I ever have a problem with the 1/4 tank problem then I can turn off the FASS and just us my stock fuel pump to get to the gas station or where ever.

Any help guys?

Thanks,
Vince

and you will, I upgraded to the 150/150 last weekend, changed over from the 150/95. Anyway, I sat in the middle of a crowded intersection waiting on somebody to bring me some fuel, I let the tank down to +/- 1/4 tank. I finally was able to get 5 gallons in the tank, but still couldnt start it, we finally towed it to a quiet side street and finally got it primed.

My 150/95 never did this to me, I always let it get past 1/4 tank. I'm going to try just putting a switch on the ground wire (its the most acccesible) and see if I can turn the pump off when I start getting low. The old 150/95 was a flow thru and would let me drive with it not running, hopefully the 150/150 is as well.

You probably need to flip the kill switch before the trouble starts, like I said earlier, it was a bastard getting the system re-primed.

So is this problem with the stock fuel pickup??

I know with my air dog I used the supplied 1/2: draw straw and have run my tank on empty for 40 miles with no troubles.

I haven't had any problems yet. Just want to have a back up just incase. I'm in between 1/4 and empty right now and no problems yet. I even get on it to see if it wants to die. Will see.

It will run with the FASS system off. The reason it has trouble below 1/4 tank is that there is so much fuel being drawn up into the pump ( and subsequently being returned through the fill neck ) that the tank is being sucked dry, or at least aerated. Think about it, 150 gallons per hour is 30 gallons every 12 minutes. That means on a full tank all of your fuel went through the filters once every 12 minutes! The 95 gallon per hour is plenty for any truck running 600 HP or less.

You make a good point Huck. Never thought of it that way.

I know If I run out of fuel I have to pump a lot into the tank before the truck wants to fire again. But at least I dont have to prime the system.

I also hate that I have to shut my truck off to fill it because the return line from the air dog trips the auto shutoff on the nozzle. I think Ill redo this with a 180* AN fitting when I redo the install this winter. Then I can mount the return the opposite way so it flows down to the tank and not up the filler neck.

You make a good point Huck. Never thought of it that way.

I know If I run out of fuel I have to pump a lot into the tank before the truck wants to fire again. But at least I dont have to prime the system.

I also hate that I have to shut my truck off to fill it because the return line from the air dog trips the auto shutoff on the nozzle. I think Ill redo this with a 180* AN fitting when I redo the install this winter. Then I can mount the return the opposite way so it flows down to the tank and not up the filler neck.

if you flipped that filler neck piece does the line then hit the bottom of the bed?

The return line goes into the filler neck close to where the fuel cap is. I am thinking of going with a larger GPH system for my new motor. FASS has a pickup kit where they use a stand alone pickup in the tank. I thought I could either use that or the TTS / SoCal pickup kit I have now as the feed line and the other for the return. I would keep them spaced as far away from each other as I could and hopefully reduce the splashing that happens with the fill neck.

Kyle. Just brainstorming here but I would imagine that if I rotate the 180* fitting it would not come into contact with the bed.

I think Im going to write air dog a new instructions and parts manual for the Air Dog for the DMaxes. Theirs just sucks. think they will buy it from me???

If not maybe Ill make the durallymax special install kit. hehe.

I need a hobby.

The return line goes into the filler neck close to where the fuel cap is. I am thinking of going with a larger GPH system for my new motor. FASS has a pickup kit where they use a stand alone pickup in the tank. I thought I could either use that or the TTS / SoCal pickup kit I have now as the feed line and the other for the return. I would keep them spaced as far away from each other as I could and hopefully reduce the splashing that happens with the fill neck.

yea that would work, i've talked to people that have used the pickup tube from the AD kit as their return.

Kyle. Just brainstorming here but I would imagine that if I rotate the 180* fitting it would not come into contact with the bed.

I think Im going to write air dog a new instructions and parts manual for the Air Dog for the DMaxes. Theirs just sucks. think they will buy it from me???

If not maybe Ill make the durallymax special install kit. hehe.

I need a hobby.

would they buy it probably not, but i know for a fact that they would take it in a minute if their were actual chevy pictures and directions in it.:D

Well I guess I have something to do then. For bragging rights.

It will run with the FASS system off. The reason it has trouble below 1/4 tank is that there is so much fuel being drawn up into the pump ( and subsequently being returned through the fill neck ) that the tank is being sucked dry, or at least aerated. Think about it, 150 gallons per hour is 30 gallons every 12 minutes. That means on a full tank all of your fuel went through the filters once every 12 minutes! The 95 gallon per hour is plenty for any truck running 600 HP or less.

Well sorta. The issue is the stock sending unit. Its restrictive on some trucks. What happens is when the tank drops below 1/2 or so, it drops below the bottom of the lower cup portion of the sending unit. This inturn moves all the refreshing of the fuel to the bottom of the cup only. With the 150 GPH and even some 95 GPH pumps, this can out run the fuel coming into the sending unit as the FASS recirculates to and from the fuel tank. SO what happens is the cup runs dry and the truck shuts down or fuel pressure drops.

Some have relocated the FASS return line to the sending units and this has fixed this low tank issue. If this is done, i would recomend a tube be run towards the bottom of the sending unit cup to reduce splashing.

OR the draw tube can help as well, but there is still some potential for sucking air under 1/4 under extreme braking or accel.

The FASS does have a bypass built into the system that will allow fuel to be drawn through the pump and filters when the pump is off. No matter what GPH it is.

idk just my 0.02 cents and idk had this before with the supplied air dog pickup, but i believe if you get a 1/4 tank problem even with the pickup is caused when guys drop there tank, it squats out (causing the sides to kick out and the top to drop down) and they go to cut the "high Flow tube" then it comes out too short cuz when they put it back up in the truck the straps pull it back tight again and makes the pipe "shorter" then intended.....

To prevent the sending cup from running dry can you drill holes in it so it fills faster? I think NADP said they do something like that.

idk just my 0.02 cents and idk had this before with the supplied air dog pickup, but i believe if you get a 1/4 tank problem even with the pickup is caused when guys drop there tank, it squats out (causing the sides to kick out and the top to drop down) and they go to cut the "high Flow tube" then it comes out too short cuz when they put it back up in the truck the straps pull it back tight again and makes the pipe "shorter" then intended.....


I like this theory. From my reading, I seem to see "tank droppers", as opposed to "bed removers" being the majority of folks with fuel pickup problems. We should do a poll. I'm going to start one.

b

Just finished my airdog install today. Dropped the tank and luckily I dont seem to have any 1/4 tanks issues. I had less than a 1/8th tank when we took it out. It didnt seem to change shape at all while on the floor. Ran it almost clear empty today and she ran like a champ. *knock on wood*