Bad gas ?

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   I filled up at the local Chevron with supreme plus 96 octane same as I always do . Shortly after engine started "popping" at carb . Checked all plugs and they are all the same , black soot covered . Carb, fuel pump are new and worked fine before fill up . There is $135.00 worth of fuel in there , any thoughts or suggestions .

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mymark Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Nut Joined: Dec/26/2007 Location: Canada Status: Offline Points: 483	Post Options Post Reply Quote mymark Report Post Thanks(0) Quote Reply Topic: Bad gas ? Posted: Mar/26/2023 at 1:31pm
	I filled up at the local Chevron with supreme plus 96 octane same as I always do . Shortly after engine started "popping" at carb . Checked all plugs and they are all the same , black soot covered . Carb, fuel pump are new and worked fine before fill up . There is $135.00 worth of fuel in there , any thoughts or suggestions .
	Donohue

Trader Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6881	Post Options Post Reply Quote Trader Report Post Thanks(0) Quote Reply Posted: Mar/26/2023 at 1:57pm
	Water will move to the bottom of the tank, so try and pump/syphon off the bottom 5 gallons into a clear water jug if you can to see what you have. If it's just water then do the following: Add a bottle of fuel stabilizer to the tank. You live in Canada so Canadian tire caries Star Tron. Run to the busiest gas station that sells premium fuel and fill it up again. Few use 96 Octane so that underground tank likely has been condensing water all winter long. I find Shell 93 to be the most stable fuel, Mobil 94 near me is 30% ethanol - you don't want that. If the fuel is rust, drain the tank and flush the system. Put in fuel from the busiest gas station and try for something people use more like 93. If you need an octane booster, then just add it. Edited by Trader - Mar/26/2023 at 1:59pm

Heavy 488 Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Apr/27/2019 Location: In the Status: Offline Points: 3553	Post Options Post Reply Quote Heavy 488 Report Post Thanks(0) Quote Reply Posted: Mar/26/2023 at 2:09pm
	Pull the line at the carb. Crank it a few times into a container.Water or gas?

madams Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Jun/26/2017 Location: Duncan OK Status: Offline Points: 603	Post Options Post Reply Quote madams Report Post Thanks(1) Quote Reply Posted: Mar/26/2023 at 3:25pm
	I suspected bad gas and checked with the gas station. They had a measuring stick and the lowest point in the tank was below the hatch. They put some chemical on the end of the stick that turned yellow if it sensed water. Pulled the stick out and no indication of water. I was still skeptical so he got a little spit on his finger and touched it - instant bright yellow. I ended up with a carb problem, no sign of water in the carb or tank. Point is, check with the station and they probably have a way to check it. This happened to me about 20 years ago.
	68 AMX 390 4SP 67 RS Camaro 327 Auto

6768rogues Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Addicted Joined: Jul/03/2007 Location: United States Status: Offline Points: 6237	Post Options Post Reply Quote 6768rogues Report Post Thanks(0) Quote Reply Posted: Mar/28/2023 at 4:54pm
	Was it ethanol free gas? It happened to me long ago. A couple of cans of good dry gas and it ran through.
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mymark Members Profile Send Private Message Find Members Posts Add to Buddy List AMC Nut Joined: Dec/26/2007 Location: Canada Status: Offline Points: 483	Post Options Post Reply Quote mymark Report Post Thanks(1) Quote Reply Posted: Mar/28/2023 at 5:34pm
	Update - Did fuel cleansing , "popping" still there thought maybe cam lobe wiped out removed PS rocker arm cover to confirm . Problem found rocker arm exh. on # 2 cylinder had backed off and not working the valve, reassembled and adjusted made sure jam-lock nut was secure .Fired up great popping gone , running fine again . Thank you all for your help .
	Donohue