Once car starts it runs great. Previous owner changed fuel pump. I rebuilt carb, replaced all the soft lines and the fuel float. Tank looked ok. You have to crank a LOT to get it to start. If you let it sit long enough to cool off a bit, it’s once again a bear to start. Is this a common thing with these YF carbs? PO hauled around a coffee can with an oil squirter full of fuel, to ‘tickle’ the carb before start up. Wondering if the fuel pump has a bad check valve maybe? I did try to replace it after I got it, but the ones I’ve found do not have the correct arm on them (too short). Thoughts? Frank
Not sure but I would check the choke operation, float level, and make sure fuel is not boiling out the carb (vapor lock).
Once fuel is in the carb and engine shut off, pump has zero to do with keeping there. It's either boiling or leaking off. All of mine have the won't start cold after setting a few days syndrome. I attribute it to fuel evaporation/boil off after hot shutdown. Generally hot restarts are not a issue. One carb is new(well in '14), other two have both been rebuilt within last few years. Defiantly a no fuel in carb bowl condition, little if any action from pump squirters. I keep a zoom spout bottle around to prime carbs before I start.
I’ve got another choke assembly coming..broke the spade off the original while messing with it the other day. It didn’t act like it was working correctly anyways. I’ve had several cars with non functional chokes, but this one takes forever to prime. Like running the battery down forever. Guess it’s time to experiment with it. Must be boiling off..oil doesn’t smell like fuel or anything. I’ll get the choke on there and see what it does, and wrap the fuel line with something. It’s got an insulator under the carb IIRC, so maybe that needs updated…
I had one where I could never get the choke adjustment right. It opened with heat coming from the exhaust manifold. Problem was it wouldn't open fast enough and the car would starve for air and shut down. I ended up hooking a manual cable to operate it by hand in the inside of the car. Air cleaner had to be modified to clear the cable. It worked good.
If my 250 sat for a week or so I would kill the battery trying to start if I didn't use starter fluid or pour gas down the carb. I replaced the fuel pump and now I can start car after sitting for 4 or 5 weeks.
That's interesting, I suppose the fuel in line could also be draining back to the tank? A empty fuel line is going to require quite awhile to refill. There is no doubt my carbs are dry, if fuel line is also dry, would explain the excess crank time. That's why I use the zoom spout to fill carb bowl, A jigger or two of gas down the carb of my 428 makes little difference. I've considered adding a electric "primer" pump at tank to fill carb bowl before starting.
