Hi folks -
I’m working on the MK2 today, because I like to punish myself unnecessarily.
I recently rebuilt both carburetors and the thermo-choke / starting carb. The reason for the rebuilt was significant particulate (rust, etc) that had gotten up into the carburetors and the car would no longer start. The car had not been using any fuel filter and its anyone’s guess how long it had been that way.
I rebuilt the carbs and thermo-choke unit, pretty easy really, and reinstalled. I ran the fuel pump to get fuel up into the bowl and then onto the individual fuel bowls of each carb, and noted the following (engine and pump off):
Fuel was gathering and ultimately dripping out of the front carburetor - from the “throat” or place you’d attach the air filter.
Upon pulling the piston and needle out, fuel literally spouted out of the jet, I’d say it got about a half inch in height.
No fuel was leaking from the rear carb (at first)
I dropped the needle and piston back in and put everything back together, the flooding seemed to subside somewhat, so I started the car - It started almost immediately but had trouble running. I then noted that the Thermo-carb was also leaking, this time fuel was escaping from where the solenoid meets the body of the thermo-choke - not pouring, but a noticeable leak that dampened the surrounding parts and ultimately created a puddle
Due to a low battery, I was unable to get the car started again - so I’m charging the battery as I type.
I left it for the day and came back today to find that both carbs have a flooding condition, noted by fuel gathered at the mouth of each carb. No fuel ever came from the overflow tubes, tubes are clear.
- I checked and double checked the 7/16 bar method of setting the floats - but will obviously check again. The only other thing I really changed was that the valve in the float chamber was the check-ball style Grose-Jet, and I replaced those with the traditional needle and seat design that came in the kit - I’m considering reinstalling the Grose-Jets…good idea?
The carbs did not leak nor flood previously, and I am using the same floats (rubber) and even the same float setting (I’d set them previously, and really just verified it during rebuild)
Any thoughts here? Fuel pump is the same, floats are the same, I’m 98% sure of the float height and the only thing changed was the Grose-Jets to the regular needle and seat - but I read some poor reviews of the Grose-Jet, which is why i changed it. My rebuild kit was not an SU kit (none were available) but another brand kit from Moss Motors. Car did not have flooding issues before, carbs just leaked a bit from bad gaskets and were full of debris.
I did of course change the main jets, but did not change the needles (old ones looked great, and would not come out anyway) but I don’t recall fuel spouting out of the jet, even with the needle and piston removed, so I don’t think that’s the issue.