Bswope

Id like to come up with a way to still have the factory fuel system for a back up and to help eliminate the 1/4 tank issue, kinda like the fuel boss with the Hobbs switch, once the pressure drops(hence 1/4 tank issue) the hobbs switch activates the factory fuel system giving u backup fuel, not sayin the AirDog pump will fail(not worried about that at all), i just wanna be in the 7-800 hp level and not sure if i do the jeep liberty canister modd that it will be able to supply enough fuel to the AirDog pick up.
I know the factory supply wont support this kinda power but this setup would be basically for not havein to worry about runnin outta fuel at the 1/4 tank mark.

Would plumming in a "T" from the filter houseing to the AirDog supply line create a issue with flow to the Cp3, would it be able to pull air say from the factory lines, would there be air in them?
Would the hobbs switch work or would it be better to have a toggle switch in the cab to activate the factory system and where would the toggle switch need to be spliced into to work?

This might not even work fellas, im just thinkin out loud!
But what ya think?

Thanks
Buddy

jmccart

53 ****** kept his factory set up installed still, I think. Do a search & read the thread he started on his AD150 install on a magacab.

Bswope

I didnt think he went that route, i read that whole thread maybe i missed it! Ill have to go back through it.

homewrecker

If you cut your pick-up tube correctly you shouldn't have this 1/4 tank issue.Tank removed from truck on ground,support both ends with a block of wood where the straps go(keeps belly of tank at normal sag)Drill hole for pickup tube as close to canister lid as possible (forward side of cap)With canister removed,insert pick-up and feel for length(I made my own with aluminum tubing and had to cut to length)cut until the gap is around 1/8 inch.Should not have any problems when doing it this way.I have ran mine below the E a couple of times.
I also have a Vulcan drawstraw laying around and it is plastisc tubing a looks to be longer than needed(require cutting).The tubing is flexible and could easily be left a little long and let it lay on the bottom(maybe with a 45* cut on the end so as not to restrict in anyway.
With my Fass you remove the factory relay and banjo bolt at the cp-3.I keep these in my glove box in case of a failure with the fass.Simply remove the fass fuel line and fitting from the cp-3 and put the banjo bolt back with the factory fuel line and insert the relay.Back to stock!
My truck will run and run well with the fass not running,left in unplugged oneday messing with some things and forgot to plug it back up.Drove 50 miles pulling a GN trailer before I noticed I had no fuel pressure reading.Air dog from what I have read will work the same way.
Now with all this said if your running an airdog pump without the filters, the quick change back to stock and truck running with pump not working does not apply(at least with Fass,pump only models will not allow fuel passage if not running)

molalla1ton

On my Fass system I do not have any problems and have gone well below 1/8 tank. I did not install it SourceAutomotive did it and evidently Fass has a new place for the draw straw per the factory.

jmccart

Quality info shared right here.
Thanx bud.

53 willys

yeah I dont run out of fuel either(no stumbling or dieing)....BUT my FP fluctuates like crazy from 1/4 tank on down...I can sit the needle on E and still not run out of fuel...but there is a lot of 0 psi moments between 1/4 and E.....I'm not cool with sucking all that air..so I am looking for a better way.
I am not going to use the stock set-up as a back up...I am just going to plumb a bypass in and use a small pump for the "emergency pump" witch I doubt I will ever need anyway...
I spent alot of time on my drawstraw cut and I dont think I could cut it any better.....I think fluctuating psi is going to happen no matter what when you install a drawstraw...it's the nature of the beast.

06 DIESEL

On mine I switched the hard draw straw for a piece of 1/2 line and placed it in the factory pick-up retention area. I just did this last week so I have not had the opportunity to run it really low on fuel but I know that I had about 5 gallons in the tank and it still ran fine.

53 willys

I wanna here about FP reading's......mine will run fine all the way to pegged on E....but the FP is all over the place.

molalla1ton

When I took my truck in to get the Fass put on they wanted 1/4 tank or less in it, I had just a pinch over 1/8 tank. I mentioned to them about the 1/4 tank issue and he said not to worry Fass had new quieter unit and the 1/4 tank issue had been resolved by putting the draw straw in a different location, (and maybe a different style straw? I will have to check on that, anyway by the time I got to a fuel station I was well below 1/8 tank and I still had 21-22 psi on my fuel guage - I WAS watching it pretty closely

Hvytrkmech

I have since removed my diagnostic fuel pressure gauge, BUT I left it in the loop for the first week after the A/d 100 install. The fuel pressure readings fluctuated rapidly at a little less than 1/4 tank. Absolutely no drivability problems though.


Tim

06 DIESEL

As soon as I get my gauge hooked up I will let ya know how mine does under 1/4 tank.

Bswope

I may plum in a small pump, would this work........? Get the jeep liberty canister, modd it with a pickup tube have that supply the small pump and then plum it into the AirDog line before the AirDog pump that way u could run the small pump off a toggle switch and when u get to the 1/4 tank mark, flip the switch and now u have the small pump feedin fuel outta the liberty canister into the supply line to the AirDog. Now u would have the AirDog pullin in fuel (what it can get) along with the small pump pullin fuel from the liberty canister and still have the AirDog doin its job of filtering and removin the air.
Dont mind me fellas im just thinkin outside the box so if it makes no sence just call me a!!

Festus

The only flaw I'm see is that if the pump is pushing more than AirDog draw, you'll overpressure. If the added pump pushes less, you'll starve the Dog.

I'm going to try to do my a bit simpler. I'm going to place my Vulcan draw straw more toward the middle of the tank. If I can't I'm thinking of a flexible line off the bottom toward the middle of the tank. For my backup, I'm going to leave the OEM system in place just disconnect the plug at the tank (cover ends) and cap the CP3 feed line after disconnecting. This way if I need it, connect the OEM CP3 feed line back up and plug the OEM wire harness back in at the tank and get her home. I figure 15 minutes depending how cold and how much mud I have to lay in.

bluechrome

I don't know why you guys want a back up pump. Our cp3's are strong enough to run the tuck even without the lift pump working Trust me or ask Diesel Dan(FASS) I drove for three hours without my pump Plugged in
But, The truck will run to the point you can't tell unless you real get on it or look at your gauges. I'm not a gauge watcher during normal transit