Hi there. I have a mercruiser 140 with a mercarb and the accelerator pump doesn't seem to be working properly. The only way the engine will start is with a shot of starter fluid then it runs fine but I notice that the accelerator pump dosent squirt gas into the carb only intermittently, when I disconnect the throttle cable and manually pump it everyonce and while it will squirt a weak stream but other times just bubbles. when I do get the engine going when I advance the throttle there is a good bogging and very noticeable when on the water and trying to accelerate, almost stalls and have to back off throttle and pump it a few times to keep it going. I need to know how the pump works exactly. does the gas in the bowl need to be high enough to spill over into the cylinder that the pump slides up and down, there is a notch on the side so this would seem so. I tested the pump to make sure it works by filling the cylinder with gas then replacing the top of the carb and manually pumping the pump, a nice stream of gas squirts out from both sides so I know there isn't blockage. But when I reatach the top of the carb and the fuel line, get the engine going with starter fluid, shut it off again and then test the pump there isnt a squirt of gas with the bowl full, explaining why the engine wont start without starter fluid, does start right off without starter fluid when the engine is hot and has just been running. So is the float setting too low not allowing gas to enter the cylinder that houses the accelerator pump or is the setting of the accelerator pump wrong or could it be possible that the pump is the incorrect length. This is a new pump and I completely rebuilt the carb so everything is new. When I went to set the settings for float and pump from the specs given in the kit there wasn't a reference to my carb on the sheet. I took the carb to a dealer and they ordered a sierra rebuild kit 18-7097 so I assume is was the correct one. Since playing around with this, the pump became stuck and the rubber skirt tore so I have since ordered a new kit that is a mercarb kit number 804845. My questions are how do I set the pump and the float properly? and is the float measured when open or closed and how is the distance measured as far as what reference points are used when measuring for both the float and the pump. Carb is 1389-9350
Thanks
Thanks
