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Car Forum / Jeep / May 2006Advice For Older Jeep Owners
Now that MTBE has been removed from gasoline, the government mandated replacing it with 10% ethanol. If you are running an older engine (like the '64 Olds V6 in my CJ), the alcohol will tear up the fuel pump and hoses. I speak from experience when my '61 Jeep died and I had to call the flatbed to get it home. Fuel pump pressure had dropped to about 1psi. I replaced the stock pump with a Purolator/ Facet electronic pump (around $40) and get a steady 4psi at the carburetor. (If you are running one of the older Dupree plunger pumps, be advised that the alcohol will tear up the bellows in it too. There are no replacement parts to solve the problem.) Be sure to replace the old hoses and fuel filters too. Alcohol will tear up older rubber hoses and they can plug the filter inside the carburetor inlet.  SignatureBill Lahr mr.bill@pcmagic.net Same goes for the 258 engine! The owners manual states 'no' amount of alcohol is safe in them. My float needle maybe lasts a year before getting gummed or crudded up. Do you know about the fuel pumps on those? Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590 (More Off Road album links at bottom of the view page) > Now that MTBE has been removed from gasoline, the government mandated > replacing it with 10% ethanol. If you are running an older engine (like [quoted text clipped - 12 lines] > Bill Lahr > mr.bill@pcmagic.net Mike, If the engine dates from the mid-80's, it's probably okay. The older ones (my Olds Oddfire is a '64) use a rubber bellows and rubber flapper valves in the mechanical pump. The $40 Purolator/Facet electronic pump doesn't have any rubber parts. The one I use has a 4-6psi output, for a carburetor. (Only drawback is noise. Mount it properly to the frame or it will sound like a Model T when you are idling.) If you have fuel injection, your system is probably safe enough for alcohol already. I've used Arco gas for years, never had any problems with it. When MTBE was being phased out, they added a small amount of alcohol, 3-5%, which wasn't enough to hurt the rubber parts. Now that MTBE has been banned, they upped the alcohol to 10%. All the gas is like that now. When my Jeep stalled, the lady at the auto club and the tow driver both said they have had a lot of calls lately from owners of older cars that simply stopped running. Ethanol in the gas is like welfare for mechanics and new car dealers. I replaced the accelerator pump and float needle/seat in the Rochester carb, so hopefully I won't have any more problems. Now I have to check my '71 Datsun 240Z to be sure the alcohol isn't going to screw it up next. Bill > Same goes for the 258 engine! The owners manual states 'no' amount of > alcohol is safe in them. My float needle maybe lasts a year before [quoted text clipped - 25 lines] >>Bill Lahr >>mr.bill@pcmagic.net SignatureBill Lahr mr.bill@pcmagic.net > I replaced the accelerator pump and float needle/seat in the Rochester > carb, so hopefully I won't have any more problems. Now I have to check > my '71 Datsun 240Z to be sure the alcohol isn't going to screw it up next. Twenty years late is better than never, I guess. Grump, I thought this was going to be a thread full of advice for us old Jeep owners, not just owners of old Jeeps. ;) > Now that MTBE has been removed from gasoline, the government mandated > replacing it with 10% ethanol. If you are running an older engine (like [quoted text clipped - 8 lines] > filters too. Alcohol will tear up older rubber hoses and they can plug > the filter inside the carburetor inlet. SignatureJerry Bransford PP-ASEL N6TAY See the Geezer Jeep at http://members.cox.net/jerrypb/ Actually all replacement pumps and carburetor kits made since about 1985 (?) are made to be used with alcohol. Before that period the best valves, diaphragms, and hoses were made out of neoprene, which dissolves in alcohol. Another bad rap we got during the japanese invasion. God Bless America, Bill O|||||||O mailto:LWHughes3rd@aol.com http://www.billhughes.com/ > Now that MTBE has been removed from gasoline, the government mandated > replacing it with 10% ethanol. If you are running an older engine (like [quoted text clipped - 12 lines] > Bill Lahr > mr.bill@pcmagic.net > Actually all replacement pumps and carburetor kits made since about > 1985 (?) are made to be used with alcohol. Before that period the best > valves, diaphragms, and hoses were made out of neoprene, which dissolves > in alcohol. Another bad rap we got during the japanese invasion. They were hardly the best then, were they? Alcoholproofing one's fuel system has been acknowledged as a necessity for like twenty years now. Drag racers and off roaders are still using Holley if the really want to go fast: http://www.holley.com/categories.asp?division=Holley yep, twenty years ago ARCO snuck a ten percent alcohol into their gasolines to meet Kalifornia's SMOG requirements. ARCO, being the cheapest that didn't ping I used until my engines flooded with bad needle valves. God Bless America, Bill O|||||||O mailto:LWHughes3rd@aol.com http://www.billhughes.com/ > They were hardly the best then, were they? > > Alcoholproofing one's fuel system has been acknowledged as a necessity > for like twenty years now. |
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