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Have to prime to fill float bowls when sitting more than 24 hours

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Guest

Guest
Hi,

Ive noticed when my 78 GS750 sits more than 24 hours. I have to prime my bike in order for it to start easily. It usually takes 4-5 seconds for the fuel to stop flowing (clear fuel filter). I don't remember needing to do this on my other GS' that I had in the past. The carbs were cleaned a few months ago and I didn't see any real wear on the needle and seat. I know the floats themselves float properly and don't sink when placed in gas. Is this normal? Should I be pressure testing my float pins and seats?

thanks in advance
Matt
 
Did you check fuel level in the bowls? It's important to do this, not just set float height. Assuming the fuel level is correct you shouldn't have to prime after only 24 hours unless it's super hot outside.
 
@nessism I did both. Everything seems fine on that front. It's about 70 degrees out today but a little cooler in my garage.

thanks
Matt
 
I have to prime my fuel bowls if the bike sits for a few days, doesn't matter the temp either. A minute or two and it's fine. Starts right up.
 
Sounds odd, like others stated earlier... usually over a week of sitting for mine. Did you check the fuel level on the bench or bike? While running?
 
So it must be leaking out, that means the needle valves aren't tight.
You'll have to find out why. The floats are set too high, or the needles need to be replaced.
 
Last edited:
Is your bike magically producing oil?

(In other words, double and triple-check for gas in the oil.)




The only other thing I can think of is if you left the tubes off the bowl vents, gas could evaporate a little sooner.
 
Last edited:
bwringer said:
Is your bike magically producing oil?

(In other words, double and triple-check for gas in the oil.)




The only other thing I can think of is if you left the tubes off the bowl vents, gas could evaporate a little sooner.
Click to expand...
I noticed how quickly the gas evaps from carbs during July. A few hot days and I gotta prime them too.
 
bwringer said:
The only other thing I can think of is if you left the tubes off the bowl vents, gas could evaporate a little sooner.
Click to expand...

That's the first thing that popped into my mind - you'd be surprised how quickly fuel can evaporate when those vent hoses are left off.
 
Actually I did leave them off when I cleaned the carbs.. I don't recall my other GS series bikes having the vent tubes attached either but it's been awhile. I'll try that first before I tear into the carbs again.

thanks guys!
Matt
 
mattd1205 said:
Actually I did leave them off when I cleaned the carbs.. I don't recall my other GS series bikes having the vent tubes attached either but it's been awhile. I'll try that first before I tear into the carbs again.

thanks guys!
Matt
Click to expand...

Yup, put them back on, there are there for a reason.
 
I've swapped out my needles and seats and checked my float heights. Everything seems on point but it still does the same thing. Very puzzling.

Matt
 
mattd1205 said:
It usually takes 4-5 seconds for the fuel to stop flowing (clear fuel filter)
Click to expand...

first thing that struck me was clear fuel filter do you have an extra filter they are not recommended as generally they will not allow the amount of fuel to pass through if this is an extra I would recommend you remove it.
 
fastbysuzuki said:
first thing that struck me was clear fuel filter do you have an extra filter they are not recommended as generally they will not allow the amount of fuel to pass through if this is an extra I would recommend you remove it.
Click to expand...

I just have the one inline filter. is it superfluous? I know I've got a filter in the petcock but I'm hesitant to run without the inline because I know there is some debris at the bottom.

Matt
 
We'll personally I would take off the tank and swill the debris out reinstall and remove the xtra filter this filter can and will likely cause running problems and I was wondering if when running the level in the bowls is low so when you finish a ride there is little fuel in the bowls this may be the cause of having to prime before it will start.
these filters are generally designed for a pumped or pressurised system and the Gs is gravity fed thus restricting the flow.
 
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