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

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wa500

New member
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?
 
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.
 
TyBoo":27gkf5us said:
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.
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No separate filters.

Pulling this line off requires emptying the tank I assume but can be done without removing it?
 
wa500":3lgft4fl said:
ssobol":3lgft4fl said:
Might also check the tank vent for that tank.
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Where is the vent located? Would cracking the gas cap while underway test for this?
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Vent outlet should be on the outside of the gunwale a little aft of where the fuel filler is. It looks like a silver knob about 3/4" x 3/4". The opening is at the bottom.

Depending on your gas cap, "cracking" it might not be sufficient. Opening it fully will test for the vent problem though.
 
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
 
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.
 
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.
 
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.
 
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.

[/img]https://i.imgur.com/IBOC8NU.png
IBOC8NU.png
 
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?
 
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.
 
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.
 
I usually buy that sort of stuff at West Marine or LFS. I like LFS a bit better here, but that is just one man's opinion.....I suspect both will have it or can get their hands on one. And Seattle does have both of those stores. Soaking was not a terrible idea by the way :-)
 
So I helped paul pull this out and its in a cup of vinegar in my kitchen. Pulled it out this morning and it works just fine now. I was not aware that there was a one way ball valve in the 90 degree tank pick up. They are not in my tanks but my boat is far older. should work just fine now. I would buy another for a back up. Paul will be putting it back in in the next few days. this boat sat for a long time and the valve most likely went dry and being its aluminum ( brass would be a better choice) it oxidized to its self, the spring and ball in the housing. I know they are not expensive but why throw away something that works??? It fill land fills faster? You should see my garage, in the spring we tossed about half my garage so I guess it went to the land fill anyway. I just hate throwing parts at something unless I know what the problem was. If Paul had took it to a shop it would have been $1000 for shop time and who knows how many of the wrong parts. People need to learn to find the problems them selves, It makes you a better boater, drive, rider flyer,,, pick you poison.
 
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.
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As Bobs the winner... yes I would replace it with a unit with out the check valve.
 
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