Home › Forum › Ask A Member › Johnson 5.5 CD-13 carb issue. › Re: Johnson 5.5 CD-13 carb issue.
Update: I took apart my pressure fuel tank, and found it with a thick layer of old gas residue on the bottom of the tank. I drained the contaminated fuel and used some steel wool to break up and remove the junk. Luckily the tank turned out smooth and clean with no rust. I filled it up with fresh 100 LL Aviation fuel, mixed it 16:1. The motor started right up, and ran great. I even took it out on a small 10 foot flat bottom boat. Only let down is that it wouldn’t idle as slow and smooth as before. It ran smooth and strong in high Rpm’s. But just wouldn’t lean out like normal on the slow side. Won’t idle below "shift" it used to idle beautifully at "slow" on the throttle.