Airdog 100 sucking air - Diesel Truck Forum - TheDieselGarage.com
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Old 01-01-2009, 07:36 PM Thread Starter
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Airdog 100 sucking air

Ok, I just installed an Airdog 100. I had issues getting it installed at a 1/2 tank of fuel. I filled up the tank, and it worked fine. I drove the truck for a couple of days, got down to a half tank, and started losing fuel pressure. So I filled the tank up, and now keeps fuel pressure, about 13-15 psi. So basically I'm asking, where could I be sucking air. Is the sending unit bad, maybe a hole in the suction line. I'm not sure.

2004 Silverado 2500 LLY Duramax
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Old 01-02-2009, 01:32 AM
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I found out the hard way that my sending unit was bad. It took out vp44 when it ran out. VP was probably on its way out anyway.

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Old 01-02-2009, 02:17 AM
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Quote:
Originally Posted by cowboytw13 View Post
Ok, I just installed an Airdog 100. I had issues getting it installed at a 1/2 tank of fuel. I filled up the tank, and it worked fine. I drove the truck for a couple of days, got down to a half tank, and started losing fuel pressure. So I filled the tank up, and now keeps fuel pressure, about 13-15 psi. So basically I'm asking, where could I be sucking air. Is the sending unit bad, maybe a hole in the suction line. I'm not sure.
Your hooked to the stock sender correct?

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Originally Posted by JLWelding View Post
I found out the hard way that my sending unit was bad. It took out vp44 when it ran out. VP was probably on its way out anyway.
Yeah I had the samething happen with me... Just after my AD 150 was installed my fuel sender went out. But now I've got it replaced and it works fine... Dropping the fuel tank isn't hard I got it done in about 1 hour from start to finsh. The sender can be purchased at a dealer for about
$70 bucks. Quick and easy to do...

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
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Old 01-02-2009, 02:23 AM Thread Starter
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correct, it's the stock sender. I think there might be a hole in the draw straw. At least that's the only reason I can think that I couldn't pick up fuel just when I'm below half tank.

2004 Silverado 2500 LLY Duramax
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Old 01-02-2009, 02:37 AM
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Possible... But while your there inspecting your pickup assembly I would inspect the fuel gauge sender too... So no matter what you going to be dropping the tank...

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
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Old 01-02-2009, 07:13 AM
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when you fuel up below the half tank how much fuel you adding? That will give you a good gauge on how well the gauge is working.

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Old 01-02-2009, 10:44 PM Thread Starter
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I'm putting in about 18 gallons @ a little above a half a tank. (It's not the stock tank) But I'm not having problems with the the fuel gauge, just the fuel pump.

2004 Silverado 2500 LLY Duramax
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Old 01-02-2009, 10:47 PM
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my fp150 will start to suck air around 1/4-1/8 tank.




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Old 01-03-2009, 02:57 AM
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Yeah with my drawstraw I can hit the 1/8 of tank LOW FUEL light before sucking air...



Not unless I'm being stupid and getting on it on a steep dirt road I can suck at 1/4 tank but I really got to be doing something stupid...

Michael Nelson - 2002 Dodge Cummins & 1996 Dodge Ram 5.9L Gasser
116K Miles On My VP44 - 4 Years of 2 Cycle Oil Diet! - Mixed at 128:1 Ratio - 25.3 MPG maxed out!
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Old 01-03-2009, 12:33 PM Thread Starter
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The thing that I can't understand is with the stock LP, I could run it even after the low fuel light was on, and now I can't even make a half tank. :
I'll let you guys know how it turns out.

2004 Silverado 2500 LLY Duramax
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