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jking006's avatar
jking006
Explorer
Jun 27, 2016

just purchased fuel milage horrible

hello all,

not sure this is the right place for this post.
A friend of mine just bought his first RV. he has always owned travel trailers and set them up in permanent camp grounds.

bought a 1979 class c holiday rambler on a ford chassis. Has the 460 with a C 6 transmission with 3.73 gears. also has the "tag" axle.
all emissions have been deleted by previous owner and a after market holly carb and K&N filters. duel exhaust.. runs great!!!
this thing got 1.9 mpg driving 60mph for 50 miles on the highway!!
i cant imagine that is what it should be considering my 1982 gets 8 mpg with my heavy foot
everything is in order under the hood. only thing i haven't checked is the timing or looked at the size of the carb. it is a holly double pumper.. no sign that it running rich tail pipes are clean as to be expected and no fumes.
any one have any ideas??

21 Replies

  • If it were that bad it would be running very rough and belching out black smoke out the tailpipe. Either that or it is leaking fuel badly. It is possible the fuel pump is bad and it is leaking into the crankcase!