Right after Hurricane Sandy, when the electric was still out, and gas stations weren't pumping because they had no power, I had to use some old gas I had sitting around in my garage. It was foggy because of all the water absorbed by the 10% ethanol.

I ran it through my V10, because I just had to ... what did I do after that? I ran a full tank of fresh gas, which comes with 10% ethanol through it. Never a problem.

The 10% ethanol does more to "dry" the gas (if it's fresh) than any bottle of additive can, and cleans as well.

If the INSIDE of your engine is so bad that you're considering Seafoam, go right ahead, but be prepared to replace the engine when all that crud comes loose.

 

I posted just yesterday that I tried it for the first time. I can't really chime in to much on this topic. My sweety was running rich and idling rough. 2 cans only one with about 1/3 to 1/4 left in it. I did brake booster and gas tank. She sounds better when idling, cleared the code las5 night. Haven't had a chance to really drive her again. Did it work, well it did something. Only time will tell of the P0171 code comes back.

I love the waiting game. Also I typically run Exxon 91. It typically is about the same as much as 85 out my way once a week.

 

Running rich is either fuel pressure too high (bad regulator), or a leaky injector. While Seafoam in the gas MIGHT clean up the injector (a little), the Seafoam in the crankcase is not going to help it running rich.

If anything, the computer is all confused now because of the vacuum leak you created disconnecting the brake booster line

(I don't know why I'm in such an argumentative mood today, maybe it has something to do with a major software company trying to screw my employer out of a few $10K today. I apologize in advance)

 

Good to know on the pressure to high Krewat. Don't recall reading that anywhere else.

What if I like my lady confused,lol. She seems to be running as she should. Maybe I'll confuse the ole lady and see if it works with her too.

 

And it might not even be the regulator itself - it uses engine vacuum to go from low-pressure (28-30) to high-pressure (38-40) - if the vacuum lines going from the manifold to the regulator are leaking, the regulator won't see the vacuum and go to full wide-open (38-40) lbs.

Oh, and I like my "old lady" confused too Sometimes. I can buy stuff without her realizing