crap

Finally got the vette to start.was wondering if it is ok to run regular unleaded gas in a L82 350 small block engine (the original engine ) in a 1975 corvette stingray? Or do you have to run 100% gas no ethanol? Also put brand new battery in this car and it won't start it. It won't do anything.the lights do come on.the grounds seem to b ok.It will start in a heartbeat when you put a battery charger on it.It is sidepost, thinking about changing it to top mount since this battery has both of them.took the battery back to Advance Auto and it checked out fine when he put a load on it.thanks

lars

Pump gas with ethanol is just fine. The fuel requirements for a mid-70's 350 L82 Vette are no different than the requirements for a 350 Impala Station Wagon.

7T1vette

I have an L-48 ('71) and it runs on unleaded regular with no problem. The L-82 has 9.0:1 compression. Not sure if that will run well on regular or if you will need mid-grade fuel. It will NOT need premium fuel.

crap

Thanks alot .I was hoping it would run on pump gas.

crap

Thanks alot.I was hoping it would run on regular unleaded gas. That 100% gas is a little expensive.

Rescue Rogers

did you try cleaning the posts really well. you could try jumper cables from the top posts to the sides to see if it is a post problem

crap

Thank you .

HeadsU.P.

Its tough to find "No Start Issues" but 90% are ground issues. (or poor grd ) You have old cars, lots of fiberglass, rusty frames, poor cable connections. Sometimes a Grd looks fine from the outside but can be heavily corroded internally. One the first things any C3 owner should do is remove the BATT Grd first, then remove, wire brush and reinstall all the connections. There is one at frame near the battery box, another at the starter. Clean both ends of the cable terminals and even the bolts / washers, etc.

Ethanol issues most of the time are during storage. Ethanol has a shelf-life. Some say the shelf-life is 60 days then things began to go sour. If you keep fresh gas circulating through the fuel system you should be fine. Winter storage however or long term should receive a treatment into the gas tank.

crap

Thank you for the advice.

jb78L-82

I ran 89 octane ethanol gas in my 78 L-82 for most of its life before the rebuild in 2014. I would recommend 89 with an L-82 (9:1 compression) and the 882 smog heads which are known to run the engine hot for emissions (and for cracked heads from the thin castins and high heat).

The 78 C3 is the only carb car I own (the others are all Fuel injection) and the 78 L-82 has gone through 33 years of very cold winters with no additives to the gas ever for at least 4-5 months of not being used with zero fuel issues. Some of my fuel injected cars that are not daily drivers can go longer periods with the same fuel in the tank with zero issues and no additives as well. My personal experience is that as long as you replace the fuel at least once per year, you should be good. The shelf life of gas is longer than you think.....

7T1vette

You can try using 87 unleaded; but I would recommend that you run the tank nearly out before youi pump 87 in...and only put in 1/2 tank (or less). Drive it around, but stay close to that station. If it starts to run cr@ppy, head back to the station and fill it with 92 or 93 (whatever that station has for premium). The mixture will get you back up to the octane level where it will run well.

Hey! If it runs OK on 87, more power (figure of speech ) to ya'....

Bikespace

I tried 87 octane in my 80 L48. It ran fine, then kept running after I turned off the ignition. I switched to 93 octane and the run-on problem went away.

No doubt there is something else wrong, but this quick fix worked for me