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|Where to start - Carb leaking during idle/operations and for several minutes afterwards||Tony S.||8-29-16|
|Hey all - I apologize if this has been covered elsewhere, but I didn't see anything. So...here goes:|
I have a 1983 Honey class C, built on a Ford E350 chassis with a 7.5L V8 (460 cid). It has a frame-mounted electric fuel pump (if that matters to anyone reading). No smog pump installed currently. We bought it about 3 years ago, ran it to Yellowstone and back from ND, as well as several other road trips in the last two years. Last year, we took it out to a family get together and things just "didn't seem right." Made it out and back, but something just didn't sit right with me about how it was running. Got home from the weekend, parked it, started it up to listen to it run, looked at it while it was running, and then turned it off. Looked at it about 5 minutes later and noticed that the top of the intake manifold was wet. Ruh roh.
Getting ready to start it up again and decided to put some seafoam in the tanks, just because, and when I opened the gas cap on the rear tank (tank last in use while running), noticed that it was pressurized quite a bit. Big "whoosh" as I opened the tank. Huh...that's strange, right?
Decide that, even though it's not quite due for an oil change, I'm already crawling around on the ground, etc. so why the heck not. Open up the drain plug and splooosh! WAY too much "oil" coming out, of way to thin a viscosity, with a *very* distinct fuel smell. All in all, roughly 10 quarts of fuel/oil mixture pour out of the crankcase. Ok, now I'm *really* worried.
Change the oil, fire it up, and let it idle for about 20 minutes. All seems well and the "didn't seem right" sounds and feelings largely went away. Enough that we made one last trip (about 90 miles round trip) for the season last fall before we parked Honey for the winter. Continually checked the dipstick to see if it smelled "fuelly," but it was non-detectable at all starts and stops for the trip. Gas tank (rear one, mainly), did pressurize during run time, so I'd always open the cap once we parked. I did notice fuel dripping onto the intake when we'd stop, so I'd try to clean it up as best as I could once the engine would cool down a bit.
Haven't fired it up at all this year, due to family stuff (graduations, funerals, etc.) and just doing more stuff around town with the kids. Not wanting to let it sit all year without starting and thinking we might try to take it out over Labor Day, I get to work.
First order of business - change the oil. Even though the last oil change only had about 100 total miles on it, I didn't want to run the risk that a bunch of fuel leaked down into the crankcase. Pull the plug, dump the oil - almost as good as new and no fuel smell. Off to a good start. Pump the gas 3-4 times to prime the carb and then start turning it over. Lather, rinse, repeat a couple times until it catches and takes off. Now, ever since we've owned it, I've had to sit on the pedal and keep it revved to about 1500-2000 rpm upon starting, usually for about 5 minutes or so until the engine warms up, then it will idle on it's own at approximately 1000 rpm.
So, I get it to idle on it's own after about 10 minutes or so. Not too worried, since it hasn't been run, even turned over in almost 10 months. I go look at the engine while it's running and I notice that fuel is dripping onto the top of the intake manifold while the engine is running. It's not a flood, but it's enough to be noticeable and of concern.
I have very little engine experience. I'm mechanically inclined enough to effect simple repairs, but I don't even know where to start with troubleshooting this one. Uncle, retired Ford mechanic, diagnosing this issue from 200 miles away, says to replace the carb. With what little google-fu I've done so far, I see that I could either do that or re-build the carb myself if I'm interested in a challenge (not sure I am).
I'm looking to any experts/experienced mechanics and people who've run into this problem - Is the carb in need of replacement? Does that fix jive with the apparent symptoms? Anything else I should be considering/worrying about?
Any and all help is more appreciated than you know. Thanks!!