Engine Stumbles Under Full Power
 

With the power key on, in 1st gear, at around 5k RPM, I have a stumble. However in 2nd, I don't have a stumble at all.

The gas is over a year old but I did add two cans of octane boost so I am going to run this tank out first then put fresh gas in to see if I have a fuel issue.

I just replaced the pumps and I hope that isn't the issue cause man that was hard to get back in. I also checked the pumps and checked the check valves.

Dave

(SOLUTION: Gas was bad, new gas solved the issue - ZBrink)

Re: full power stumble
 

Does it happen with the power key off?

Re: full power stumble
 

FWIW, Last year I had the fuel pumps replaced in my car. During the intial drive home from the repair facility, I had a similar stumble when I tried to accelerate past traffic or overtake a vehicle. Once I got the car home and refueled the car, the problem never repeated. I don't know if it was because of pressure in the tank or what but it never ocurred again.

Re: full power stumble
 

When I changed the pumps, it showed a half of a tank. I have since driven it with the new pumps about twenty miles.

This morning it was acting a little worse. I wanted to run more of the bad gas out but instead I went and put a fresh 10 gal in and the gauge registered a 1/4 shy of Full. It ran perfectly afterwards.

Was it the bad gas or the fuel level?

I hope I didn't bend the float when I put the pumps in. If I did how, do I reset it??

Dave

Re: full power stumble
 

bad/old gas - damned E10 stuff has no shelf life - say 6 months or less. My 91 was bogging badly after a heat soak restart and with some fresh fuel today it's back to normal.

Re: full power stumble
 

Good read on the subject of E10.
http://www.fuel-testers.com/expirati...hanol_gas.html

Re: full power stumble
 

Well, isn't that special - maximum shelf life of 3 months. Just my luck the tank life is 3 weeks ...

And I heard that more corn is used for ethanol than food now. I used to be a midwest farmer so I can empathize with them, but federal subsidies to brew ethanol ... what will they think of next, subsidies to grow nothing?
Oh, never mind, I just remembered "Kennedy hay" from the early 1960s;
farmers paid to grow acres and acres of weeds on fallow land.

end of rant and, yes :proud: