M
msuel
Guest
"I have 1993 4.3LX Merc with a
"I have 1993 4.3LX Merc with a Weber 4BBL that has a cold start problem. In order to get the engine to start, I have to prime the engine (by putting the throttle in neutral and pumping) 20 or 30 times, then crank the engine for 4 or 5 seconds. Then I have to prime the engine another 20-30 times, crank again. I repeat this process 3 or 4 times and she finally starts. I can get the engine to start everytime with this process, but it shouldn't require this effort. Also, once it is started, it runs and starts perfectly all day. Starting is only a problem if she has been sitting.
I first suspected a choke problem. However, the choke works perfectly, closed when cold. The problem is definitely lack of fuel. I removed the flame arrestor and watched as the throttle was pumped and engine cracked. Eventually, the jets started to spray fuel into the carb and the engine started. I suspect a problem with the accelerator pump in the carb (losing its prime) or a problem with the fuel pump. Any info appreciated. Any suggested troubleshooting tests to isolate the problem?"
"I have 1993 4.3LX Merc with a Weber 4BBL that has a cold start problem. In order to get the engine to start, I have to prime the engine (by putting the throttle in neutral and pumping) 20 or 30 times, then crank the engine for 4 or 5 seconds. Then I have to prime the engine another 20-30 times, crank again. I repeat this process 3 or 4 times and she finally starts. I can get the engine to start everytime with this process, but it shouldn't require this effort. Also, once it is started, it runs and starts perfectly all day. Starting is only a problem if she has been sitting.
I first suspected a choke problem. However, the choke works perfectly, closed when cold. The problem is definitely lack of fuel. I removed the flame arrestor and watched as the throttle was pumped and engine cracked. Eventually, the jets started to spray fuel into the carb and the engine started. I suspect a problem with the accelerator pump in the carb (losing its prime) or a problem with the fuel pump. Any info appreciated. Any suggested troubleshooting tests to isolate the problem?"