Engine stalls under load only on one gas tank? c-dory 22

wa500

I want to get your thoughts on this one.

One of my fuel tanks will run the motor fine. The other one will stall when the load gets over 1/4th-1/2 throttle, but otherwise will run it fine. That makes makes me thing its a fuel flow issue with only that one tank.

What would me the most likely problem?

TyBoo · Posted: Fri Apr 28, 2023 10:44 pm Post subject:

Sounds like the screen on the suction hose may be plugging up. A short term fix is to disconnect the fuel line from the tank and stick on a short clean piece of tubing. Then blow through the thing for all your worth or use a short burst of compressed air to knock all the sediment off that has accumulated on the screen.

If that alleviates the problem then you'll need to take the pickup tube completely out and clean the screen thoroughly and also look into the bottom of the tank to see if it is in need of a cleaning inside.

This is assuming you don't have separate filters for the two tanks and haven't first checked that.

ssobol · Posted: Fri Apr 28, 2023 11:31 pm Post subject:

Might also check the tank vent for that tank.

wa500 · Posted: Fri Apr 28, 2023 11:48 pm Post subject:

wa500 · Posted: Fri Apr 28, 2023 11:50 pm Post subject:

ssobol · Posted: Sat Apr 29, 2023 11:34 am Post subject:

gulfcoast john · Posted: Sat Apr 29, 2023 3:09 pm Post subject:

The hose date of mfg is on the hose (it may have been laying around the factory a few years). The manufacturers advise replacing gas lines at 10 years (though I haven't yet). If all else fails, something to consider at 16 years. Some internal bulges can't be detected. Using E10 gas makes hose issues more likely. Good luck!

John

thataway · Posted: Sat Apr 29, 2023 10:05 pm Post subject:

Another possibility is a malfunction of the anti siphon valve, which is the hose barb at the top of the fuel pick up tube. I have had those restrict flow, and removed that ASV replaced with just a hose barb fitting.

thataway · Posted: Sat Apr 29, 2023 10:09 pm Post subject:

Another possibility is a malfunction of the anti siphon valve, which is the hose barb at the top of the fuel pick up tube. I have had those restrict flow, and removed that ASV replaced with just a hose barb fitting.

MannyBridge · Posted: Sun Apr 30, 2023 10:24 am Post subject:

Also check all your fittings/clamps. Last summer I had a loose one that was allowing air to be drawn in at higher RPM/load. The engine would sputter and almost stall.

tsturm · Posted: Sun Apr 30, 2023 9:12 pm Post subject:

wa500 · Posted: Thu May 04, 2023 1:51 am Post subject:

It looks like the check valve was the culprit, white powdery stuff was blocking flow. I have it sitting in a vinegar cup overnight. We'll see if it fixes it.

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thataway · Posted: Thu May 04, 2023 2:40 am Post subject:

They are not all that expensive: I would buy a new one. I have one "out of the box" be bad.

What do you think is the comosition of "white powdery stuff"? Related to ethanol? Water in the fuel? Old sealant?

T.R. Bauer · Posted: Thu May 04, 2023 11:21 am Post subject:

I agree with Bob - buy a new one and be done with it. The white stuff looks like the remains of some sealant on install and the part doesn't look like it has chemically reacted with anything. It is common they fail.

wa500 · Posted: Thu May 04, 2023 11:24 am Post subject:

Where do you get the new one? Half of the issue would be finding the right thread and part #, so I just dunked it. I see a million on Amazon for $9, but it's unclear what to use.

In any case, blowing through it its obvious its restricted, so testing if its fixed will be easy.