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THIOKOL/LMC/DMC Technical Issues Forum Technical repair issues & questions for Thiokol/DMC/LMC

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Old 01-03-2018, 10:53 PM
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Default Switching between Main & Aux Fuel Tanks on 1404 Imp

I can't seem to get my Imp to run off the Main fuel tank, does it take a lot of cranking to get the fuel up from the tank with the mechanical fuel pump? My fuel tank selector valve appears to use the 6 o'clock position for the Aux tank, 9 o'clock for the main tank, and 3 o'clock to shut off the fuel flow, does this seem about right? Is there some trick or something I am missing?
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Old 01-08-2018, 02:41 AM
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Default Re: Switching between Main & Aux Fuel Tanks on 1404 Imp

I was able to get the Imp to run off the main tank today so I am guessing the fuel line must have frozen when I was in the mountains as the main tank is more on the outside of the Imp than the aux tank (aux tank on mine is inside as it is a full body Imp), thus more exposure to cold air. I had poured a can of Seafoam in the tank before filling it with 94 octane fuel that had no ethanol but I guess Seafoam doesn't work as gas line antifreeze or I hadn't put enough in.

The fuel valve positions I stated above appear to be correct, in case someone needs to know 10 years down the road.
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Old 01-08-2018, 11:35 AM
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Default Re: Switching between Main & Aux Fuel Tanks on 1404 Imp

You need “heat” for your gas anti freeze. Yellow bottle. Here in Montana it’s a regular additive this time of year. I use it in the aux gas can and chainsaw gas too. Last thing ya need is a freeze up in the middle of nowhere.

Could also be crap floating around in the tank too.
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Old 01-08-2018, 05:22 PM
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Default Re: Switching between Main & Aux Fuel Tanks on 1404 Imp

Quote:
Originally Posted by Thebartman View Post
...Could also be crap floating around in the tank too.
That is all I need...
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Old 01-16-2018, 12:13 PM
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Default Re: Switching between Main & Aux Fuel Tanks on 1404 Imp

Darn, I think there is something floating around in there as it will run off the main tank while stationary but once it starts moving and bouncing it starves out.
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