What's up with my AirDog

[jlwelding]

Your going to think I am crazy, but what would make your fuel pressure go up when you hit your brakes. Pressure runs steady 17psi hit the brakes and it goes up to 18.50 almost 19.:shrug:It has done this since I replaced my airdog 100 with the 150.

[Heavyd1980]

Um bad ground?!?

[dorkweed]

Full tank, half tank, or empty tank?????? If it happens more as your fuel gets lower, it could be something along the lines of that your draw straw/pickup tube is too short or is moving around in the tank.Your gauge could be going out. When you slow down/hit the brakes, does the gauge needle fall in the direction of the front of the truck???Could be a bad ground like said above that is affecting the pump itself.......or if electrical gauge it could be affecting the sender.

[guesswho512]

the only time i had a problem with my airdog, was when the corrosion on the battery terminals was bad enough to give a weak connection. i don't have a gauge in the cab, so it may be normal.

[jlwelding]

:shrug:It does itfull, empty it dont matter. It is a manual gauge. I been thinking about it and I wonder if a air bubble in the line would cause this? The line is coming off the pump and it is running along the side of the frame rail, if it had a bubble along the frame and when you apply the brakes gravity would push forward?

[Heavyd1980]

i guess thats a possiblity but i found when my fuel pressure was doing funky crap like that it was water hammer. do you have a fuel snubber or needle valve installed?

[jlwelding]

It's a a a a regulator I cant remember what you call it.

[Heavyd1980]

did u get her figured out JL?

[Mopar1973Man]

Ummm... If I'm not missing something but AirDog is a lifetime warranty...Why not give good old Pureflow a call and see what they say...

[JJK98CTD]

Mine does it too. I have a Glow Shift fuel gauge and have a needle valve in line also.

[AH64ID]

Does it happen everytime you hit the brakes, like stopped? Or does it happen as you decelerate? My pressure goes up as I decelerate, the harder I brake the higher the pressure. I run about 8-9 normally, and can get 11-12 if I stop quite quick. If its that then its normal.

[Heavyd1980]

i noticed today under heavy braking mine dropped down to 7 then right back up to 15. and it stays anywhere between 14-15 while cruising down the highway.

[guesswho512]

its the brake lights sucking up all the electricity:lmao:but seriously, when my airdog wasn't moving much fuel, it was cause it had trouble getting power(corroded battery terminals). could you(would you wanna) wire a volt/amp gauge at the pump so you could tell if it was a power issue.

[jlwelding]

It does not do it just slowing down, you need to apply good pedal and you can get 1 1/2 pound rise.

[AH64ID]

It does not do it just slowing down, you need to apply good pedal and you can get 1 1/2 pound rise.

Sounds normal.. guess your building some -G's.

[jlwelding]

Yea it sounds weird, my AD 100 didnt do it and the pressure line is in the same place. The air bubble thing is all I could come up with. I will try to bleed it and keep you posted.