I keep getting gas in my oil. I have checked the carb 3 times, and even had a friend who knows these things better than me check it, the floats are fine. My oil gets very clear looking, and stinks like gas. What else could cause me to get gas in the oil?
Thanks

I keep getting gas in my oil. I have checked the carb 3 times, and even had a friend who knows these things better than me check it, the floats are fine. My oil gets very clear looking, and stinks like gas. What else could cause me to get gas in the oil?
Thanks

Really only two ways for a carbed car to get fuel in the oil..1) Carb flooding or some other fuel control condition or 2) fuel pump issue.

IF you disconnect the carb from teh fuel pump and the pump from the tank, and you take the carb off of your intake, how is the engine going to get gas in the oil? It's not..Therefore your issue is in one or both of these systems.

Fuel pump.

Fuel pump.

:yes: That is what my problem was as well. Changed it and now it runs perfectly. No gas in oil.:thumbsup:

Does fuel pump failure usually cause gas in oil before other symptoms appear?

Should I replace the original fuel pump on my 71 350 2bbl carb car? (60k miles approx.) because it is likely to fail? (Original alternator and waterpump were still working fine but replaced because subtle noises led to discovery that some play had developed in bearings.)

Is there a weep hole like with water pumps so that some fuel pump failures don't get oil in the gas? Is there a risk of fire with stock type fuel pump failure?

Many thanks...and sorry for any questions that seem dumb and/or searchable.

Does fuel pump failure usually cause gas in oil before other symptoms appear?

Should I replace the original fuel pump on my 71 350 2bbl carb car? (60k miles approx.) because it is likely to fail? (Original alternator and waterpump were still working fine but replaced because subtle noises led to discovery that some play had developed in bearings.)

Is there a weep hole like with water pumps so that some fuel pump failures don't get oil in the gas? Is there a risk of fire with stock type fuel pump failure?

Many thanks...and sorry for any questions that seem dumb and/or searchable.

Is your fuel pump, mechanical or electric?

Not necessarily.... Fuel not getting to carb or sputtering could be a sign of a failing mechanical fuel pump. But yes, usually the diaphragm inside the fuel pump gets a hole in it and can start leaking fuel into the oil. Either when the car is off or on. In my case, it usually happened with the car off.

Does fuel pump failure usually cause gas in oil before other symptoms appear?

Should I replace the original fuel pump on my 71 350 2bbl carb car? (60k miles approx.) because it is likely to fail? (Original alternator and waterpump were still working fine but replaced because subtle noises led to discovery that some play had developed in bearings.)

Is there a weep hole like with water pumps so that some fuel pump failures don't get oil in the gas? Is there a risk of fire with stock type fuel pump failure?

Many thanks...and sorry for any questions that seem dumb and/or searchable.

Honestly, and I am NOT one to throw parts at a problem or potential problem without troubleshooting it, in this case YES. A fuel pump for a small block Chevy is so cheap and easy to change, it is not worth taking the risk of it going out at some inopportune time. You can get a lifetime warranty with the fuel pump too, if you want it. You can always keep your original too..In addition, the originals are NOT made for gas of our current era.

There is a weep hole, IIRC, but in my personal experience, a fuel pump just outright fails, it doesn't warn you. Again, well worth the avoidance of trouble, IMHO.

Thanks. Yes, it is the original mechanical pump. (unless original owner replaced in first 29k miles). I didn't realize modern fuel could damage it.

Well I guess I'd better replace my fuel pump then... thanks for the info!
I wonder what that would cost me for a BB chevy...

BBC is probably the same price as SBC. You can get them for less than $20 all day long (at least in the USA, not sure what there is in Quebec). Lots of guys on here run a stock mechanical pump with pretty stout engines too.

Modern gas can cause problems with accelerator pumps that aren't "made" for modern gas, and since a fuel pump has a rubber diaphragm, it can suffer the same fate. I had a fuel pump that I used to run on my SBC that must have been on it for 20 years before I bought it, and I used to use Regular gas- not regular unleaded, REGULAR gas :) with no trouble. The station did away with it, and in less than a year of using unleaded with Ethanol (forced to use it, nothing else out there at that point), my fuel pump went out on me. I PERSONALLY think that because it's one of those parts that is so cheap, it is worth swapping it out. Sort of like that solid state Autozone voltage regulator lots of people rave about on here (including me). It takes less than an hour for an inexperienced mechanic to swap out a mechanical fuel pump with the right tools.