Gas cap cleaning.... - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 7 Old 04-02-2018, 11:41 PM Thread Starter
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Gas cap cleaning....

Was having low fuel performance issues (bike would sputter to a stop/stall at speed) and was beginning to think the fuel pump was getting weak or hot or the common TPS. Problem occurred when it was hot (warm in Fla standards) with 2-3 bars on level. Already performed the filter bypass and checked for codes. Read on here sporadically of tank venting issues which gave me an “a hah” moment when checked for suction of the cap after running the motor. Took the whole cap apart and boy what a mess of corrosion and build up. Not surprised after the fact since I bought the bike used and it had been sitting but never expected what I cleaned out. If it was a boat, sure. But not a motorcycle! Those vent ports are so tiny that if anyone is having any stalling or power issues with no codes, a quick tear apart of the filler cap might be a cheap solution. Warning, those little springs can sprung into an oh shit moment real easy so take care as not to lose them! You surely know why I am stressing such. Mainly the one that holds the key cover in place. And there is a little ball bearing stopper also with it. I didn’t see any detailed posts on the subject but this issue might be more common than we think. Latest is no cap suction after running the motor with a low tank. Now what do I do with this new fuel pump and TPS sensors?
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post #2 of 7 Old 04-03-2018, 10:28 PM
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My Yamaha Kodiak ATV drove me nuts for almost a year with an intermittent stalling problem that had absolutely no pattern to it. Finally after trying several other suspected 'fixes' it dawned on me that it might be the tank venting system inside the cap. Like you, it was full of corrosion and rust and took some careful cleaning and re-assembly. The 15 year old Kodiak runs like a top again...no more stalling.

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post #3 of 7 Old 04-08-2018, 11:09 AM Thread Starter
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Ok, so apparently there is more going on. The bike still wants to stall out when hits 2 bars. There is about 2 gallons left when empty the tank. Not sure what to think. Fill it up and it runs ok. Think that is the point where gas drops below the fuel pump assembly It’s like it is starving for fuel. Suspect the pressure relief valve might be malfunctioning causing too much fuel pressure relief? Thoughts anyone? I do have a new pump as a back up but the curiousity factor needs solved!
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post #4 of 7 Old 04-08-2018, 01:08 PM
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Sounds like bad pump, the weight of more gas in tank helps with fuel flow, kind of what happens in a vacuum fed carburetor when the vacuum feed diaphragm has a hole or tear in it.

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post #5 of 7 Old 04-08-2018, 01:46 PM Thread Starter
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Thanks Big B. I was coming to that conclusion also. Acid washing the tank now while apart so the new pump has a fresh clean bed to sleep in! I did notice the check valve was not sealing off properly either. Guess I will save my bypass filter kit for a future need since I splurged for a whole new assembly.
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post #6 of 7 Old 04-08-2018, 03:24 PM
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I do regular gas cap gasket and filler area maintenance, I use WD40 or marvel mystery oil on a soaked rag, and I clean/lubricate the seal. I plug the filler hole and clean out all around the top section, so much dirt/gunk/dust accumulates there and WILL make it into your tank and pump filter.

BRIAN "GO Buckeyes, GO Wildcats"!

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post #7 of 7 Old 04-08-2018, 11:25 PM Thread Starter
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Given how bad the cap was it’s now on my list of “to-do”. I am a big fan of corrosion X. Leaves a nice coating that seems to last. Popular down here in Fla with boats. New fuel pump assembly was the ticket. Most of the crap out of the tank wasn’t rust but ethanol crystals or something. Magnet wouldn’t pick them up. The pressure washer made quick work of them along with a phosphate wash. On to the next project!
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