gas in oil

raypa · 10-10-2013, 03:41 PM

I'm getting gas in my oil on my 98 g16. It's filling the oil level in the case and then I'm getting oil/gas blow back into the motor. What do you think it is? I have my thoughts, but want to hear to thers opinions first. the dipstick smells like gas and oil.

Thanks,
Ray

smallblock450sl · 10-10-2013, 06:01 PM

Most likely the float/needle are sticking and the gas has no were to go but past the rings and into the crank case. Ethynol gas has alot to do with carb's getting junked up. remove and clean the carb, drain the oil/gas and replace with 1 qt only. Some members like "pure synthetic oil", it doesn't attrack the moisture from the ethynol gas like the most common "blend oils" used now.

raypa · 10-10-2013, 06:46 PM

Thanks. I was thinking valves, but I'll check the float

Snoking · 10-11-2013, 10:17 AM

Can the fuel pump do this? Chris

cgtech · 10-11-2013, 12:13 PM

Yes, ruptured diaphram in fuel pump will also fill crankcase, but, i would be looking for a "ring groove" in the carb needle first. Needle is cheaper than fuel pump, look there first with the hopes of a cheaper repair.

Snoking · 10-11-2013, 03:30 PM

Quote:

Originally Posted by cgtech

Yes, ruptured diaphram in fuel pump will also fill crankcase, but, i would be looking for a "ring groove" in the carb needle first. Needle is cheaper than fuel pump, look there first with the hopes of a cheaper repair.

I took my fuel pump apart and put it back together without additional parts. Was just check for crud(was clean)!!!! Be sure to mark the alignment of the pieces before dis-assembly.

Chris

raypa · 10-13-2013, 06:53 PM

I dumped the float as nd changed the oil
I'm going to monitor and see

sho305 · 10-13-2013, 07:04 PM

Yes usually bad float or bad pump. If float it likely will only do it when the tank is full of fuel higher than the carb.

raypa · 04-12-2014, 07:28 PM

ok... Bought a new carb and new fuel pump. I'm still getting gas in my oil. Thoughts?

Cvans · 04-12-2014, 10:06 PM

Quote:

Bought a new carb and new fuel pump. I'm still getting gas in my oil. Thoughts?

That has to be a real bummer. I sure hope you get it figured out without spending more money.
Good luck.

10-10-2013, 03:41 PM	#1
raypa Getting Wild Join Date: Jul 2010 Posts: 119	gas in oil I'm getting gas in my oil on my 98 g16. It's filling the oil level in the case and then I'm getting oil/gas blow back into the motor. What do you think it is? I have my thoughts, but want to hear to thers opinions first. the dipstick smells like gas and oil. Thanks, Ray
raypa Getting Wild Join Date: Jul 2010 Posts: 119

10-10-2013, 06:01 PM	#2
smallblock450sl Sometime's............ Join Date: Oct 2007 Location: Tacoma Washington Posts: 11,875	Re: gas in oil Most likely the float/needle are sticking and the gas has no were to go but past the rings and into the crank case. Ethynol gas has alot to do with carb's getting junked up. remove and clean the carb, drain the oil/gas and replace with 1 qt only. Some members like "pure synthetic oil", it doesn't attrack the moisture from the ethynol gas like the most common "blend oils" used now.

10-10-2013, 06:46 PM	#3
raypa Getting Wild Join Date: Jul 2010 Posts: 119	Re: gas in oil Thanks. I was thinking valves, but I'll check the float
raypa Getting Wild Join Date: Jul 2010 Posts: 119

10-11-2013, 10:17 AM	#4
Snoking Not Yet Wild Join Date: Jun 2013 Location: Washington/Arizona Posts: 65	Re: gas in oil Can the fuel pump do this? Chris

10-11-2013, 12:13 PM	#5
cgtech Over This Interview Is... Join Date: Jun 2012 Location: AZ Posts: 17,449	Re: gas in oil Yes, ruptured diaphram in fuel pump will also fill crankcase, but, i would be looking for a "ring groove" in the carb needle first. Needle is cheaper than fuel pump, look there first with the hopes of a cheaper repair.

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10-13-2013, 06:53 PM	#7
raypa Getting Wild Join Date: Jul 2010 Posts: 119	Re: gas in oil I dumped the float as nd changed the oil I'm going to monitor and see
raypa Getting Wild Join Date: Jul 2010 Posts: 119

10-13-2013, 07:04 PM	#8
sho305 Vegas modded 420 Join Date: Jun 2009 Location: West MI Posts: 15,445	Re: gas in oil Yes usually bad float or bad pump. If float it likely will only do it when the tank is full of fuel higher than the carb.

04-12-2014, 07:28 PM	#9
raypa Getting Wild Join Date: Jul 2010 Posts: 119	Re: gas in oil ok... Bought a new carb and new fuel pump. I'm still getting gas in my oil. Thoughts?
raypa Getting Wild Join Date: Jul 2010 Posts: 119