Aaron65 Posted November 13, 2006 Share Posted November 13, 2006 Hey all, I rebuilt the fuel pump on my 263...worked great but leaked oil out the weep hole. So I bought a rebuilt fuel pump, and it took longer, but now it too leaks oil out the weep hole...anybody else have an oily fuel pump or is it just me. Also, what plugs are you running in your straight 8s??? I'm running AC R45 plugs, but I'm on the fence on running R45S plugs for the extra length. I shut the car down at cruise and the porcelain is white on the plugs, even though I jetted up .002 recently. Vacuum at idle is 18.5 in. Timing is good... Any ideas? Link to comment Share on other sites More sharing options...
Bill Stoneberg Posted November 13, 2006 Share Posted November 13, 2006 I too have a leaky, oily fuel pump. Depends on the one you get but they all start to leak eventually. I cant believe Buick would have built them that way, so I figure its the oil formulation that doesn't agree with the Diaphrams. I run the AC R45 plugs, nice tan to black tips, I am running a bit rich though. Link to comment Share on other sites More sharing options...
Guest Straight eight Posted November 13, 2006 Share Posted November 13, 2006 Here is the seal that was improperly installed. As the story goes these straight eight engines were known for their blow-by. That is the combustion that got past the rings. Crankcase circulation draws air in the breather on the lower side of the engine on the driver side, and in the breather cap where oil is installed. The road draft tube is supposed to draw off some of the excessive moisture from combustion. If these path ways are not open, and some vapors have been pushed by combustion passed the rings, the only place left for it to go is out the weap hole in the fuel pump if the other areas mentioned above are clogged. The 41 and 42's had the right idea they took the excess vapors in the valve cover and permitted them to exit to the carb via a tube that went into the air cleaner. I would try to avoid any plugs with a R in their number. They seem to have a higher current draw than the 48's, and tend to mis-fire, on the 248 inchers. Have had no experience with the 263's. <img src="http://forums.aaca.org/images/graemlins/grin.gif" alt="" /> Link to comment Share on other sites More sharing options...
Glassesguy Posted November 13, 2006 Share Posted November 13, 2006 Cliff:Right idea on this early form of PCV, but it caused another problem. As my father in law, a mechanic back in those days explained, these 41s and 42s had a problem with "coking" of the carburetor jets. In other words, the crankcase fumes started plugging up the jets in the carb. If you can get hold of a copy of the 1942 Service Bulletins, Buick changed this system and issued a parts kit for going back to the original system as you described. In these bulletins,too, is described the elimimation and replumbing of the oil filters due to filter element shortages being caused by the War. Several years ago a chapter member had a nice original 41 Super, but the filter canister was gone and the oil lines routed differently. Referring to my 42 Bulletins the picture showed this replumbing exactly. I found a canister and other pieces in a salvage yard, so we replumbed his car back to its original configuration and used the filter elememts which became available for service after the War. Oops, getting off topic here. Thought this info might be of interest. Link to comment Share on other sites More sharing options...
Aaron65 Posted November 13, 2006 Author Share Posted November 13, 2006 Bill-Glad it's not just mine...I've had two pumps and I figured it couldn't be a fluke! As far as plugs go, I may need to jet up a bit more even, since we have 10% ethanol in our gas and I had to lower the float a bit to stop the car from heat soaking.Straight 8--I kind of figured that the blowby thing may have something to do with it...the pump's right down by the draft tube. The breather and draft tube are clear...the engine's got over 100,000 on it, but has good, even compression, so there'll be some blowby for awhile I'm thinking! I thought about installing a PCV kind of like what Dave was saying, but there doesn't seem to be a really good way of plumbing into the intake manifold without pulling everything apart, which I don't want to do again, since I've already had the head off this thing once...Guess I may have to live with the leaky fuel pump! Link to comment Share on other sites More sharing options...
Aaron65 Posted November 15, 2006 Author Share Posted November 15, 2006 One more thing--where is the breather on the driver's side???? I thought the only breathers were the draft tube and the valve cover breather... Link to comment Share on other sites More sharing options...
Guest Straight eight Posted November 16, 2006 Share Posted November 16, 2006 I thought you'd never ask!!Get on the drivers side of the engine, locate the carburetor, look down under the carb now look toward the fire wall, but on the engine block. There she is! Held in place with one bolt. Find it??? Link to comment Share on other sites More sharing options...
Aaron65 Posted November 16, 2006 Author Share Posted November 16, 2006 I always wondered what that was for...my other breathers are clear because I can occasionally see vapors coming from them, but I haven't checked that one! I'll give it a look--thanks! Anything else I need to know about it? Link to comment Share on other sites More sharing options...
Guest Straight eight Posted November 17, 2006 Share Posted November 17, 2006 The oil cap breather and the one under the carb should be cleaned every 5000 miles or so. Washed out thoroughly with solvent and dried. <img src="http://forums.aaca.org/images/graemlins/grin.gif" alt="" /> Link to comment Share on other sites More sharing options...
Aaron65 Posted November 17, 2006 Author Share Posted November 17, 2006 I'll get right on that...I'll bet the one under the carb has never been off the car! Thanks for the tip! Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now