Re: '52 200, ultramantic, runs rough at about 50mph or more

Posted by steve-52/200 On 2012/9/21 23:19:53

boy a problems that only show up at fifty sounds like afuel filter to me ,everything has to work great for s smooth idel ,but the big thunderbolt grets realy thirsty at a good clip slow down and its ok speed up and its not ,your not getting gas ,its going through a crudded up filter ,brake part cleaner sprayed on the ceramic do-hickey in the glass bowel will turn ift from orange varbish color to he white its spposed to be and you should be back on track ,I had the same exact problem,already had replaced the fuel pump,blew out the fuel lines ,put in a heat shield over the fuel pump ,wrapped the fuel line with heat proof stuff and added the cool glass bowl fuel filter in the line .I was mystified ,I didnt notice that een though there was no crud in thebowl the element was the wrong color