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Old 09-10-2011, 09:13 AM
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Mopar1973Man Mopar1973Man is offline
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Default Help needed with Airdog

Ok Gang...

While I was out on my camping trip and hauling around my 31' Jayco Eagle Travel Trailer I had some weird fuel pressure problems occuring. Start up cold and get 17.5 just about 18 PSI at a idle and then pull the grade up to New Meadows, ID still holding 16 PSI which is normal and fine. But now as the day got hotter and we got down around Council, ID the pressure fell off to 12.5 at WOT and idled at 15 PSI. Hua??? While I was stopped the at one place I played with bumping the starter and you can see 17-18 PSI and then hear a change in pump pitch and the pressure fall again to 15 PSI. It's like the check ball is hanging up again. So I'm going to pull it back apart and double check again. So later on down the road I pick up fuel I figured I add a extra few ounce of 2 cycle oil than typical. Well the pressure went right back up to normal 17-18 PSI at idle and remain normal the rest of the day with no problems.

(Enjoying our camping)

Now hitched back up early morning and started my way back out of Lowman, ID and got good strong fuel pressure. But by the time I got to Banks, ID the fuel pressure was starting a to fall again. It went back down to the 12-15 PSI range again. On a few other stops I play again with bumping the start and sure enough yo can see 17 PSI for a burst of a second or two and then falls with change of pitch of the pump. I wondering if the fuel temperature is effecting the check ball and spring some how that its not working properly? Because with cold fuel its working fine but as a soon as the fuel warms up it sinks in pressure?

Yes... I got a fresh set of donaldson filters on my truck and no change with that
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2002 Dodge Ram 2500, 5.9L Cummins Turbo Diesel, 5 Speed NV4500 transmission, 4x4, 3.55 Gears, AirDog 150 fuel pump with 1/2" Big Line Kit, Stock Bosch VP44 Injection Pump, Bosch RV275 Injectors +40HP, Edge Comp Performance Box, BHAF (Big Honkin' Air Filter), Stock Holset HX35W Turbo, Straight 3" Pipe Exhaust, Crankcase Vent Mod, High Idle Mod, MPG / IAT fooler Mod, ScanGauge II, 25% Tinted Windows, DiPricol Gauges (Fuel pressure, Boost, Pyrometer), 235/85 R16 tires mounted on 16x7 Aluminum mags (weighing 62#), Custom Fog Lights, Custom Backup lights, Silverstar Headlights, 23-24 MPG

1996 Dodge Ram 1500, 5.9L Magnum V8 Gasoline Engine, 46RE Automatic Transmission, 4WD with CAD axle with 3.55 Gears, Mopar Performance PCM, Gutted Kitty, ScanGauge II, 35% Tinted Windows, 16-17 MPG

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Old 09-10-2011, 01:34 PM
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Weird.... About the only thing that would make it do what it is doing is a change in viscosity, but I can't wrap my mind around that. I wonder if it is the check sticking..... maybe from all the two cycle oil...:nya:
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Old 09-10-2011, 03:39 PM
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Mopar1973Man Mopar1973Man is offline
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Quote:
Originally Posted by MnTom View Post
Weird.... About the only thing that would make it do what it is doing is a change in viscosity, but I can't wrap my mind around that. I wonder if it is the check sticking..... maybe from all the two cycle oil...:nya:
It's not the 2 cycle oil...:sarcasm:

I'm now leaning towards the check ball regulator internally of the AirDog fuel pump. I just clean up my RV275 injectors and re-installed and flogged the truck hard. Pressure stayed up good and strong...

So I'm going to pull the pump and take a peek...
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Michael Nelson - AKA: Mopar1973Man - Forum & Articles
2002 Dodge Ram 2500, 5.9L Cummins Turbo Diesel, 5 Speed NV4500 transmission, 4x4, 3.55 Gears, AirDog 150 fuel pump with 1/2" Big Line Kit, Stock Bosch VP44 Injection Pump, Bosch RV275 Injectors +40HP, Edge Comp Performance Box, BHAF (Big Honkin' Air Filter), Stock Holset HX35W Turbo, Straight 3" Pipe Exhaust, Crankcase Vent Mod, High Idle Mod, MPG / IAT fooler Mod, ScanGauge II, 25% Tinted Windows, DiPricol Gauges (Fuel pressure, Boost, Pyrometer), 235/85 R16 tires mounted on 16x7 Aluminum mags (weighing 62#), Custom Fog Lights, Custom Backup lights, Silverstar Headlights, 23-24 MPG

1996 Dodge Ram 1500, 5.9L Magnum V8 Gasoline Engine, 46RE Automatic Transmission, 4WD with CAD axle with 3.55 Gears, Mopar Performance PCM, Gutted Kitty, ScanGauge II, 35% Tinted Windows, 16-17 MPG

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Old 09-10-2011, 05:17 PM
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Mopar1973Man Mopar1973Man is offline
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Here we go... My AirDog Removed and laying on the workbench.





Here is the standard check ball and spring setup.




Here is my setup with 2 shiming washers to increase pressure.




Here is one washer laying on top of the fitting.




Here is the washer slid a little to show it.




Here is how I install the fitting and washers to keep them lined up.




With a little time and clean up... I'm back to 20 PSI idle and 18 PSI WOT...




To this day I don't know what causes this check ball to misaligned with the spring or jaming the check ball down into the coils of the spring but I know if I take the time and remove the check ball and blow the port out with compressed air it will work for many more months till one day the pressure falls off and a filter check doesn't fix it...
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Michael Nelson - AKA: Mopar1973Man - Forum & Articles
2002 Dodge Ram 2500, 5.9L Cummins Turbo Diesel, 5 Speed NV4500 transmission, 4x4, 3.55 Gears, AirDog 150 fuel pump with 1/2" Big Line Kit, Stock Bosch VP44 Injection Pump, Bosch RV275 Injectors +40HP, Edge Comp Performance Box, BHAF (Big Honkin' Air Filter), Stock Holset HX35W Turbo, Straight 3" Pipe Exhaust, Crankcase Vent Mod, High Idle Mod, MPG / IAT fooler Mod, ScanGauge II, 25% Tinted Windows, DiPricol Gauges (Fuel pressure, Boost, Pyrometer), 235/85 R16 tires mounted on 16x7 Aluminum mags (weighing 62#), Custom Fog Lights, Custom Backup lights, Silverstar Headlights, 23-24 MPG

1996 Dodge Ram 1500, 5.9L Magnum V8 Gasoline Engine, 46RE Automatic Transmission, 4WD with CAD axle with 3.55 Gears, Mopar Performance PCM, Gutted Kitty, ScanGauge II, 35% Tinted Windows, 16-17 MPG

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Old 09-10-2011, 07:49 PM
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Quote:
Originally Posted by Mopar1973man View Post
It's not the 2 cycle oil...:sarcasm:
I knew that.... hence the tongue wagging.... Anyhow, that is a strange one. I don't see how it would change since it cannot really move.
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1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
Duct Tape can't fix stupid, BUT it can muffle the sound
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Old 09-10-2011, 07:57 PM
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Mopar1973Man Mopar1973Man is offline
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Quote:
Originally Posted by MnTom View Post
I knew that.... hence the tongue wagging.... Anyhow, that is a strange one. I don't see how it would change since it cannot really move.
Well I haven't been able to get a pic of the ball jammed in the coils of the spring it seem everytime I get lucky and have it stuck again I drop it on the floor and it pops apart.

I've had the black check ball wedged inside of the coils of the spring many times now... Been trying to fab a shouldered washer that fit over the coil so the ball can't wedge into spring any more.
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Michael Nelson - AKA: Mopar1973Man - Forum & Articles
2002 Dodge Ram 2500, 5.9L Cummins Turbo Diesel, 5 Speed NV4500 transmission, 4x4, 3.55 Gears, AirDog 150 fuel pump with 1/2" Big Line Kit, Stock Bosch VP44 Injection Pump, Bosch RV275 Injectors +40HP, Edge Comp Performance Box, BHAF (Big Honkin' Air Filter), Stock Holset HX35W Turbo, Straight 3" Pipe Exhaust, Crankcase Vent Mod, High Idle Mod, MPG / IAT fooler Mod, ScanGauge II, 25% Tinted Windows, DiPricol Gauges (Fuel pressure, Boost, Pyrometer), 235/85 R16 tires mounted on 16x7 Aluminum mags (weighing 62#), Custom Fog Lights, Custom Backup lights, Silverstar Headlights, 23-24 MPG

1996 Dodge Ram 1500, 5.9L Magnum V8 Gasoline Engine, 46RE Automatic Transmission, 4WD with CAD axle with 3.55 Gears, Mopar Performance PCM, Gutted Kitty, ScanGauge II, 35% Tinted Windows, 16-17 MPG

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