Wednesday, May 20, 2009

Fuel System Fixes

As the Memorial Day Weekend approaches, I decided that today would be a good day to check and make sure the engine started, as last time I tried to start the 440 for Benjamin, we had no luck. So trying again today, it would try to start with spray start, but not stay running. When triggering the accelerator pump on the carb, I would not see any fuel squirting in. So I checked the filter (I have a big one that is really for a fuel injection set-up) and it had no restrictions. So, with the filter disconnected, I cranked the engine, and still no fuel. The generator would start and run, and the tank has only one pickup line (I could see the fuel flowing in the filter when the generator was running) so I knew that there was enough fuel in the tank and at least the pick-up was not plugged. Calling around for a fuel pump, there were none to be had locally, but I could have one in the morning. Why don't they keep parts in stock for a 30+ year old carb? (LOL) Instead, I decided to purchase an in-stock electric in-line fuel pump and pre-filter. I installed them and bypassed the mechanical pump (to be removed when I can get to it). The engine started and ran fine after fuel filled the carb bowls, so I closed the cover and started clean-up.

Note the filter on the right is the PRE-filter to the pump. (left is toward the front)

After a while I started smelling gasoline in the cabin. Upon opening the engine cover, the problem became apparent. There was A LOT of gasoline leaking out of the gasket on the left side of the carb. If I had taken it out on a test trip, chances are it would have caught fire.

Ok, so it is time to rebuild the carb now! I already had the kit, so I removed the carb (lots of built-up pressure remaining in the lines now, hmm, may need a pressure regulator or better yet, a high pressure cut-out for the pump?)....The carb is clean now, just waiting on the two new carb bowl floats on order to arrive on Thursday morning. Let up hope that the new rebuild can handle the pressure, if not, I will have to resort to the measures listed above.

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