stall and no start

[Josh Oldenburg]

Finally getting my super duty idi finished and chase down all the gremlin, and they strike again. I just had it running verifying no leaks and letting the alternator charge the batteries when she developed a miss and within a minute stalled. Every attempt has failed to get her to fire again and stay running. I have an electric pump inline behind the mechanical for priming, i thought maybe i had air so i turned her on. No air in system and the return side has new o rings and caps. New BB injectors and a rebuilt 90cc pump from wes at CDD. She popped off and stumbled once after i turned on the electric pump but stalled again right away and killed the batteries shortly after. Even had the charger on 200amp start assist to help. spun fast enough, have fuel, and juice at the fss. Im at a loss right now. Even ether just makes it want to ether lock.

 

[Thewespaul]

Pull the return line off and make sure it’s not clogged and pressurizing, also make sure you didn’t burn a fuse. With the key on you should here a click as you connect the front connector on the pump

 

[Josh Oldenburg]

Wes with the electric pump running I can see fuel running into the return line. I'm using clear line there. I also have 12 volts to the fss. I will listen for the click. How much resistance can be in the return line? I do see fuel pooling up at the steel line in my frame. I thinks it's normal and just filling up until it hits the same height as the top of my tank. But have not ever checked resistance


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[Josh Oldenburg]

Truck fired up again this morning after some cranking and I let it run again. Got some video of it running smooth and then got some video of it spitting sputtering installing. It is pushing bubbles out the return line. Pulled the nipple off of my fuel filter head and pressurized air came out. I then turned on the electric lift pump again and it started pushing the air out of the system and pushing fuel back through. Where would I be sucking air from I've double checked everything and used Vaseline on barbs before I clamped them with hose clamps

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[IDIBRONCO]

Maybe from before the lift pump? You can't purge the air from the system if your electric pump is sucking air.

 

[Josh Oldenburg]

I only have an air issue when the electric pump isn't running

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[Josh Oldenburg]

From the lift pump to the tank is a solid stainless steel line

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[IDIBRONCO]

My next guess would be either the machanical pump itself or the rubber line between the electric and mechanical.