Gasoline Storage

Plenty of information here.

Hi massih,

Please clarify your statement "gasoline and engine oil mixes together". Is this happening in your bulk storage tank, in the vehicle tanks, how on earth is engine oil getting introduced into the gasoline?

"Out technical team says the problem is in the type of gasoline(Petrol)." What type of petrol are you using?

As far as regular-unleaded gasoline, yes, gasoline goes bad after being stored for long periods.

1. is it correct conclusion that age affects the gas quality? Yes

2. if the gasoline is stored for a long period, will its quality and characteristics be affected by long duration storage? Yes

3. Does it have shelf time (storage time) for the purchased gasoline. Try this web site – It has much info on gasoline storage: http://www.google.com/search?q=how+long+can+gasoline+be+stored&sourceid=ie7&rls=com.microsoft:en-us:IE-SearchBox&ie=&oe=

4. Is there any regulation or criteria for the gasoline storage (i mean to keep the quality as standard and fresh) I cannot answer as far as any regulation but on the tank farm I worked at we stored 800 gallons in an AST (above ground storage tank) and 1200 gallons in a UST (underground storage tank) for our facility equipment use. We would often have up to 50% gasoline remaining in our tanks from the drop purchased 14 to 16 months earlier. Our biggest problem was moisture (water) in the gasoline after 6 to 8 months. On the advice of our distributer (after a lab test), we installed a 10 PSI nitrogen blanket on both tanks which alleviated the moisture (water absorption). We also began treating the gasoline (when delivered) with a product similar to Sta-Bil. Sorry, I cannot remember the industrial trade name but I was told that it is the exact same product as Sta-Bil.

Good Day All,

Thank you for your replies.

• Re Gasoline type: Premium (no unleaded) Gasoline.
• In all our gasoline cars and trucks, we've reported that it was noted in regular oil checks that the engine oil in crankcase increases, gets diluted (less viscose), and smells gasoline by time. is it because of "Old Gas"? or any other possible reasons and causes might be ? please comment.

I appreciate new participants with relevant discussion.

What to do on our ASTs (Above ground storages) and USTs as well.

Best wishes,

I have noticed that some drivers are in the habit of revving their engines up to high revs and then switching off the ignition. This sucks in fresh fuel as the revs die down but as it is not burnt it just accumulates and runs down the cylinder wall into the sump, washing oil off as it goes. This has the highly undesirable effect of diluting the oil and removing the protective film of oil from the cylinder walls that is needed during cold cranking.

This has nothing to do with the age of the fuel.

Old/stale fuel smells awfull. I know that diesel fuel can grow fungus in it so i suspect that old petrol may also grow a fungus. So in the tank that i had with stale fuel in it i removed the tank, emptied the fuel, added a handfull of crushed rock,with water and bleach and shook the whole tank to scrub the inside clean. I had to repeat the process several times to remove the smell ( fungus? ) and the visible coating on the metal. I did this because simply draining the tank and refilling with fresh fuel didn't work because very soon the fresh fuel went stale i.e. it stunk and the motor wouldn't start.

A modern additive may work to prevent this. The fuel in this case had been sitting in the tank for some years.

gasoline in the oil suggests a faulty engine, as one of the other posters says DONT rev engine before switching off.

If this doesnt help its poss your engines are worn so blowby is happening ie some fule is getting past the pistons.

its also poss in the heat the fuel in the carbs is expanding and spilling out into the inlet manifold and thus into the engine,

the only way to stop this would be to switch fuel off and let engine stop as a result this would leave the carbs empty

The only ways that fuel should get into the oil are from an engine with an old mechanical fuel pump that has a ruptured diaphragm or a defective needle and seat in a carb that does not seat, combined with a fuel tank that is mounted higher than the carb. Or possibly a fuel injected engine that has a leaking injector that continues to leak fuel into one or more cylinders after the engine is shut off. BUT all of these would be giving you other drivability issues that you did not mention. Something just does not sound right here.

If the engines are fuel injected and the injectors are not sealing properly at low pressures they will dribble fuel into the cylinders and ultimately into the sump while they are just sitting!.

One of my uncles had this happen some years ago with a new Volvo.....after it had been serviced by inexperienced people .....