DBXL FID 870ML Fuel tank issues

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Bryan K.

Bryan K.

Well-Known Member
Messages
268
Location
Richmond Hill, Ontario
Hey guys, I've having issues with the fuel being fed to my carb when it reaches levels below 50%. I purchased the FID 870ML taller tank. I see the fuel filter is laying sideways on the bottom of the tank so it looks submerged for the most part. When I accelerate to top speed, I get bogging from fuel cutouts when I'm around 50% and below on the tank. I guess the fuel sloshes to the back of the tank starving the carb of fuel. Even worse if I brake hard, the motor just cuts out completely. Below 30% full sometimes the idle gets rough too. This is my first gasser so maybe this is just a normal thing that people deal with, but does that mean to get it running properly I have to keep fuel levels to 50% and above? Not a huge issue, but would be nice to get consistent run times past the 20 min I get per half tank. Any tips or tricks to solve this issue? Do you guys typically run the fuel filter in the middle of the tank or towards the back? I'm guess it has to be fully submerged at all times otherwise it'll get air in the lines. I also think the taller and shorter FID tank would intensify this problem as a taller tank would allow more sloshed fuel to accumulate on one end while accelerating or braking. Might not to be an issue off road, but I mostly run on tarmac. Maybe the fuel tank could use some chambers at the bottom to eliminate this problem.

thanks,
 
Last edited:
dougstar said:
sound like you need to tune your carb + lengthen the fuel line on the inside of your tank so that the filter is right on the bottom:unsure:(y)
what motor and carb setup are you running?
Click to expand...

Fuelie 30.5cc and Walbro 997. I've spent weeks tuning the carb and finally got it running perfectly. I don't want to touch the settings again. BTW, the filter is literally sitting at the bottom of the tank in the middle.

mark35 said:
I bet you have your fuel lines on the wrong way around.
The line in the tank with the filter on goes to the bottom (flow) of the carb.
Click to expand...

Good point, that would actually explain a lot. Will double check that when I get home. That would be bad though because it would mean I've been running with no filter for weeks.
 
Bryan K. said:
Fuelie 30.5cc and Walbro 997. I've spent weeks tuning the carb and finally got it running perfectly. I don't want to touch the settings again. BTW, the filter is literally sitting at the bottom of the tank in the middle.



Good point, that would actually explain a lot. Will double check that when I get home. That would be bad though because it would mean I've been running with no filter for weeks.
Click to expand...

You can also add a heavier fuel filter ,or add some weight onto the existing filter to keep it on the bottom .
in RC airplanes ,they install what you call a fuel clunk ,it is heavy to were the fuel line chases the fuel in inverted
flight or g-forces!
 
Get the butterfly filter it has wings on it might help .... When you brake it cuts off check eyeball your carb throttle shaft if it moves back then you have to adjust the linkage the throttle linkage from servo to carb
 
Turns out I did in fact reverse the lines. Having no experience with gassers I assumed the intake line was the one going to the top of the carb where the priming bulb was. Also, no idea why FID decided to use the transparent yellow line as the return line and the solid black as the intake. That makes no sense.

Anyways, will also use a weighted heavier aluminum filter. Thanks guys.
 
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