Air Bubbles

[robeward]

My cousin has a Yamaha F150TRX. I have been out with him several times and the engine runs fine idle and WOT. Sometimes after idling for a while if you cut the engine off you have to pump the bulb a couple times for the engine to crank, but it cranks fine after the pump.

Somewhere along the way it was suggested to install a clear fuel line from the bulb to the engine to look for air in the line. Sure enough there are air bubbles showing up all the time in the line. Some are even rather long but as you watch them go in, the engine never misses, hiccups, sputters or anything.

Should he be concerned with this as he going crazy trying to stop this thinking it is a problem, or would we all see bubbles if we had a clear fuel hose?

Is he taking even more of a risk off shore with a clear line that probably isn't marine grade than just living with pumping the bulb maybe once a day?

 

[99yam40]

Re: Air Bubbles

The clear tube is for temporary troubleshooting, not intended for normal use. Put the regular hose back on.

If air bubbles are showing up in the line, the fuel system is sucking air in and should be addressed

 

[robeward]

Re: Air Bubbles

Cool thanks. Just wanted to make sure it was worth the trouble. He has gone through many things but I think he is about to take it to somebody. He was only using the clear hose for troubleshooting but it has been up there for a month or better now. We will keep trying.