Fuel Delivery Issues

[Peteg]

Yesterday cruising along on flat road my 1500 asked to be put on reserve about a gallon too early. Once on reserve and after fill up with the fuel valve back to normal all was good. I suspect I have a partial blockage in the strainer, fuel valve, or vent? Is there anything else I should be looking at?

[98valk]

if OEM petcock vacuum diaphragm is wearing out restricting flow.  more fuel in tank creates more head pressure overcoming the bad diaphragm

https://www.valkyrieforum.com/bbs/index.php/topic,37577.0.html

https://www.valkyrieforum.com/bbs/index.php/topic,128455.0.html

https://www.valkyrieforum.com/bbs/index.php/topic,119537.0.html

[Chrisj CMA]

+1 for suspecting early signs of petcock failure. That’s how my headaches started. It got worse. I rebuild the vacuum side with a cover set. Then the selector knob side wore out. Scrapped it and went with a Pingel. No more issues for the last 15 years

[Willow]

It does sound very similar to what happens with a fuel line with a dip in it.  If one has replaced the fuel line (as with a quick disconnect unit) it can result in the occasional air bubble that needs extra pressure.

[Peteg]

Thanks, the fuel line looks good, no quick disconnect, so I'm leaning toward the petcock valve. I like the diaphragm valve - getting forgetful in my old age. I'll make sure the tank vent is good and likely spend the money for a new petcock and strainer kit. Honda Parts Nation and Partzilla point me toward a Honda 16950-MZO-033 petcock kit but then Partzilla says it doesn't fit my bike - the picture looks great. Can anyone tell me if the available Honda part fits? Also the K&L 347385-461249 at parts giant seems to be direct replacement at about 1/2 the cost of the Honda part. Any opinions on the K&L?

[98valk]

Thanks, the fuel line looks good, no quick disconnect, so I'm leaning toward the petcock valve. I like the diaphragm valve - getting forgetful in my old age. I'll make sure the tank vent is good and likely spend the money for a new petcock and strainer kit. Honda Parts Nation and Partzilla point me toward a Honda 16950-MZO-033 petcock kit but then Partzilla says it doesn't fit my bike - the picture looks great. Can anyone tell me if the available Honda part fits? Also the K&L 347385-461249 at parts giant seems to be direct replacement at about 1/2 the cost of the Honda part. Any opinions on the K&L?

just get the rebuild kit instead of paying $$$ for a new petcock. easy to rebuild.

[Chrisj CMA]

Thanks, the fuel line looks good, no quick disconnect, so I'm leaning toward the petcock valve. I like the diaphragm valve - getting forgetful in my old age. I'll make sure the tank vent is good and likely spend the money for a new petcock and strainer kit. Honda Parts Nation and Partzilla point me toward a Honda 16950-MZO-033 petcock kit but then Partzilla says it doesn't fit my bike - the picture looks great. Can anyone tell me if the available Honda part fits? Also the K&L 347385-461249 at parts giant seems to be direct replacement at about 1/2 the cost of the Honda part. Any opinions on the K&L?

get the rebuild kit instead of paying $$$ for a new petcock. easy to rebuild.

I agree. The cover set will buy you some time. When it fails again just scrap it and get a Pingel

[98valk]

Thanks, the fuel line looks good, no quick disconnect, so I'm leaning toward the petcock valve. I like the diaphragm valve - getting forgetful in my old age. I'll make sure the tank vent is good and likely spend the money for a new petcock and strainer kit. Honda Parts Nation and Partzilla point me toward a Honda 16950-MZO-033 petcock kit but then Partzilla says it doesn't fit my bike - the picture looks great. Can anyone tell me if the available Honda part fits? Also the K&L 347385-461249 at parts giant seems to be direct replacement at about 1/2 the cost of the Honda part. Any opinions on the K&L?

get the rebuild kit instead of paying $$$ for a new petcock. easy to rebuild.

I agree. The cover set will buy you some time. When it fails again just scrap it and get a Pingel

rebuilt mine 20yrs ago still going strong, however I also installed a snubber in the vacuum line at the same time to soften the high pulsation to the diaphragm when on/off on the throttle during shifts, esp., during higher rpm shifts.

[Joe333x]

Non vacuum petcock is also an option. I'm running this on my bike along with an electric fuel shut off. Now I have no vacuum lines on my bike that can fail. Part #16950-MAL-603.

[Peteg]

Thanks all for this great information! It was 84 degrees in North Texas today, so I started by running the gas down in the tank and functionally testing the vent. Not a bad job