Last fall I got the 327 SBC in my 62 Lark started and running. It was a new rebuild. Broke in the engine, but then noticed it seemed to be running a little rough. Was roughest between 2000- 3000 RPM. Did all the usual diagnostics. As I ran it more, it got a little better but not that much. It probably only has an hour of run time after break in since I started it and put it away for the winter. So I took the carb off to get a look see and found a very fine sediment on the bottom of the float bowls. I sucked the fuel out of the bowls and I cleaned off the sediment with q-tips, I tipped the carb onto a clean paper towel to let the fuel out of the passges inside the carb some of the fuel came out clean but I got some out that was tinged brown.
The entire fuel system including the tank is new except the carb which I bought used but reportedly had never been installed. It's an Edelbrock 1406 manual choke and was in the box and looked new. I removed the top of the carb and it looked new inside, so I stopped there and put it back together. Based on the date on the box it was several years old, but appeared unused.
So I'm wondering if perhaps the carb was used once and had fuel remaining in the passages, accelerator pump, etc. and this sediment could be remnants of varnished up fuel inside the carb that dissolved after I put fuel in it and ran it for a while, and if so if that could be causing the rough running I'm experiencing. My only other thought is bad gas, but I've never gotten bad gas. Also, could fine sediment like that get past a fuel filter? Like I said everything else was new. Thanks
The entire fuel system including the tank is new except the carb which I bought used but reportedly had never been installed. It's an Edelbrock 1406 manual choke and was in the box and looked new. I removed the top of the carb and it looked new inside, so I stopped there and put it back together. Based on the date on the box it was several years old, but appeared unused.
So I'm wondering if perhaps the carb was used once and had fuel remaining in the passages, accelerator pump, etc. and this sediment could be remnants of varnished up fuel inside the carb that dissolved after I put fuel in it and ran it for a while, and if so if that could be causing the rough running I'm experiencing. My only other thought is bad gas, but I've never gotten bad gas. Also, could fine sediment like that get past a fuel filter? Like I said everything else was new. Thanks