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  1. #1

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    The Danger of Running on Reserve!

    I am now working on a second GRP/XLT that damaged a cylinder while running on reserve. The first time as well as this time a cylinder was damaged due to apparent leanout while running hard while on reserve. Both times teardowns showed carbs with no apparent problems, but further searching found a restriction in the fuel tank pickup assembly. The reserve fuel pickup tube on both had "grown" to a longer length, actually pushing the bottom of the fuel pickup cell (where the flapper is located) and effectively sealing off the reserve pickup tube. On my GPR, the tube was actually pushing the bottom plate out of place. On this XLL, it was pushing it slightly, but reserve flow was way restricted. I had been draining the fuel tank of old fuel by pressurizing the vent fitting, while attaching a hose to the main fuel filter to drain to a gas can. When the "on" line was drained I switched to reserve and not hardly any fuel would come out, even at 3# pressure in the tank. Thats when I remembered the problem I had had on my GPR. Click image for larger version. 

Name:	XLT Reserve Starvation 002.jpg 
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ID:	257113Click image for larger version. 

Name:	XLT Reserve Starvation 001.jpg 
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  2. #2
    Moderator RX951's Avatar
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    This is a very good point you surface!

    more info too here, check out Mikes thread click here

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