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Gas smell in oil???

  • Thread starter Thread starter gsvol
  • Start date Start date
G

gsvol

Guest
I have put new jets in and cleaned carbs and put on a new OEM petcock..bike runs super starts and run when cold no choke

but i still have a SLIGHT gas smell in oil
 
Do not run it !! Until you figure out what's up. The petcock is the usual suspect. Is the oil over the sight glass ? Drain a little and check it. Did you leave it on prime ? Oil changes are cheaper than new engines. ;)
If you do have oil in your gas and you address the issue and repair it. Put in fresh oil run it for fifty or so miles. Then do another oil change and change the filter as well this time.
 
Fuel Petcock

Fuel Petcock

gsvol said:
I have put new jets in and cleaned carbs and put on a new OEM petcock..bike runs super starts and run when cold no choke

but i still have a SLIGHT gas smell in oil
Click to expand...

I checked 1980 model airboxes across the board and they all have drain tubes. This is important because if fuel leaked from the petcock to the carbs, (via the vacuum hose) it can drain out the exit tube.

NOTE: Is your vacuum hose clear? (see-through) If so, you'd be able to see fuel going into the carbs.

Of course, the fuel travel depends on if the bike was on the sidestand or the center stand. And also the angle of the carbs facing the engine.

gsvol said:
dont know

its the 1980 petcock with no knob

i will pull hose off and see if gas runs free
Click to expand...

[You didn't mention what type of bike you have and so I found the GS550 petcock with no knob]

Follow the steps as suggested if your oil level is above the limit line.


Ed
 
GSXR7ED said:
I checked 1980 model airboxes across the board and they all have drain tubes. This is important because if fuel leaked from the petcock to the carbs, (via the vacuum hose) it can drain out the exit tube.

NOTE: Is your vacuum hose clear? (see-through) If so, you'd be able to see fuel going into the carbs.

Of course, the fuel travel depends on if the bike was on the sidestand or the center stand. And also the angle of the carbs facing the engine.



[You didn't mention what type of bike you have and so I found the GS550 petcock with no knob]

Follow the steps as suggested if your oil level is above the limit line.


Ed
Click to expand...

no its not a clear tube

its on its center stand

its a 1980 GS750L

oil is not above full line
 
AirBox

AirBox

gsvol said:
no its not a clear tube

its on its center stand

its a 1980 GS750L

oil is not above full line
Click to expand...

Alright...I've still got the parts site open and see your airbox looks similar to mine. If fuel leaks towards the airbox, there's a reservoir and drain tube behind the clutch gearbox. It happened to me and I was wondering why fuel was leaking under the engine.

So, how are you smelling fuel in the oil? Is it seaping from the heads?


Ed
 
Last edited:
GSXR7ED said:
Alright...I've still got the parts site open and see your airbox looks similar to mine. If fuel leaks towards the airbox, there's a reservoir and drain tube behind the clutch gearbox. It happened to me and I was wondering why fuel was leaking under the engine.

So, how are you smelling fuel in the oil? Is it seaping from the heads?


Ed
Click to expand...

i drained a little oil into a cup

no gas leaks under bike
 
Last edited:
gsvol said:
its the 1980 petcock with no knob

i will pull hose off and see if gas runs free
Click to expand...
The PRIme function on the (dreaded) '80 petocock works a bit differently than the rest of them :-k

To activate fuel flow in PRIme, you have to first apply a 'puff' of vacuum, then it will free-flow, even though the vacuum is removed.

On any other petcock, you simply turn the lever to PRIme and fuel flows (assuming it's working properly).

In the RUN position, it works like all the rest. Apply vacuum, fuel flows. Remove vacuum, fuel stops.

I can't remember which slot position is which, though, as I don't have one of them, even though two of our bikes are '80 models. Thankfully, the non-"L" shafties were spared. :pray:

.
 
Oh man!

Oh man!

gsvol said:
i drained a little oil into a cup
Click to expand...

Something might be up with your carbs...possibly. You should replace the vacuum line with a clear hose...this way you'll see if the petcock is draining too much fuel into chamber #3.

I'd be concerned because my fear would be a fire starting between my legs if too much fuel is leaking. I don't mean to scare you but I was thinking about that when I saw how much fuel was in my "T's" reservoir. I may be overreacting to that but if it's on my mind, I won't feel comfortable riding my "T".

So the problem lies with either your carbs or the fuel petcock.


Ed
 
Last edited:
Steve said:
The PRIme function on the (dreaded) '80 petocock works a bit differently than the rest of them :-k

To activate fuel flow in PRIme, you have to first apply a 'puff' of vacuum, then it will free-flow, even though the vacuum is removed.

On any other petcock, you simply turn the lever to PRIme and fuel flows (assuming it's working properly).

In the RUN position, it works like all the rest. Apply vacuum, fuel flows. Remove vacuum, fuel stops.

I can't remember which slot position is which, though, as I don't have one of them, even though two of our bikes are '80 models. Thankfully, the non-"L" shafties were spared. :pray:

.
Click to expand...

can i change PETCOCK to a diff one?
 
GSXR7ED said:
Something might be up with your carbs...possibly. You should replace the vacuum line with a clear hose...this way you'll see if the petcock is draining too much fuel into chamber #3.

I'd be concerned because my fear would be a fire starting between my legs if too much fuel is leaking. I don't mean to scare you but I was thinking about that when I saw how much fuel was in my "T's" reservoir. I may be overreacting to that but if it's on my mind, I won't feel comfortable riding my "T".

So the problem lies with either your carbs or the fuel petcock.


Ed
Click to expand...

the petcock is BRAN NEW!

and i have no gas leaks under bike
 
gsvol said:
the petcock is BRAN NEW!

and i have no gas leaks under bike
Click to expand...

as i said before, just ride it but keep an eye on things. a slight whiff of gas is not uncommon. unless you see big puddles on the floor or your oil level rises rapidly i wouldn't worry about it.........
 
Trial & Error

Trial & Error

gsvol said:
the petcock is BRAN NEW!

and i have no gas leaks under bike
Click to expand...

Yeah, it's brand new but there's no way to see if it's regulating fuel without the clear vacuum tube. So maybe it's the carbs??? You rebuilt them, right? I'm not saying you did a bad job but if the problem persists, I'd re-evaluate the carbs.

Follow Agemax's advice and just ride...eventually it should sort itself out/the fuel should burn through after several rides.

Didn't mean to get you riled up! I'm just offering possibilities from my recent experience with my fuel leak.

Ed
 
GSXR7ED said:
Yeah, it's brand new but there's no way to see if it's regulating fuel without the clear vacuum tube. So maybe it's the carbs??? You rebuilt them, right? I'm not saying you did a bad job but if the problem persists, I'd re-evaluate the carbs.

Follow Agemax's advice and just ride...eventually it should sort itself out/the fuel should burn through after several rides.

Didn't mean to get you riled up! I'm just offering possibilities from my recent experience with my fuel leak.

Ed
Click to expand...

what size is the vac line? i will pick one up on my way home
 
Does the slot on the petcock need to be up and down? or
facing from left to right

which is prime on the slot?
 
Hell I got it set in the prime postion, because I have the slot set up and down...guess this is why i have gas in oil?
 
Last edited:
gsvol said:
Hell I got it set in the prime postion
Click to expand...

if it is a brand new tap it should not really matter, although it is generally bad practice to leave it on prime all the time.

saying that, some people do, and have no problems at all. even if the tap is good, if you leave it on prime and you have a worn or sticky float valve it will dump a tank full of gas on the floor overnight.......but not in your engine!
 
Metric Size

Metric Size

gsvol said:
what size is the vac line? i will pick one up on my way home
Click to expand...


The IPB says the size of the hose is: 4.5 X 8.5.

I would suggest 1/4 inch or 3/8 inch since the sizing is metric.

Take your existing hose and goto Lowe's...I already tried AutoZone and all they had was the solid black hose.



Ed
 
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