How often do you replace your fuel filters?

[Scott & Heather]

Thanks BW! when we get back to Texas, it's top priority for me to sort this out. Yesterday on the flats, I struggled to maintain 60mph. No wind...hit any grade at all and its over. Cliff and I have chatted over the recent months and year about this and even had wwilliams in Grand Rapids take a look at it. They couldn't find anything wrong but I can't be sure they dug very far. They never even dynoed the coach. Will need to deal with this ASAP. You're right it really is sucking the joy out of this 4000 mile trip


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[muldoonman]

Have you changed the filters lately? (air/fuel) I had a air filter after I first bought the bus look clean but smoked a little at throttle and acted sluggish and changed it and never had the problem again. Wonder if throttle is full open and exhaust system clear?  If it's run good before and just started doing this, something's up for sure. 

[luvrbus]

Scott, it is real hard to get a outfit to dyno a engine in a older bus I don't think WW Wiliams will even attempt it.I know they won't in Phoenix to much liability for them a dyno will find a weak link in the drive train in a hurry so they won't touch one   

[Scott & Heather]

Interesting. I never knew that. Makes sense. Muldoon, all the obvious stuff has been checked. New fuel and air filters. No black smoke...ever. So getting plenty of air and not enough fuel. I still think the coach isn't reaching full loaded rpm. Linkage seems fine and fuel lever maxes out when throttle is floored. Something else is wrong and I'm going to tackle it when I get to Texas. Will keep y'all posted


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[luvrbus]

Scott, the engine probably has a throttle delay or fuel modulator out of adjustment or the piston is bad in the modulator if equipped with the modulator causing your problems   

[Scott & Heather]

Cliff, does a mechanical 6v92 have a modulator?


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[eagle19952]

very well could..