Re: VOLVO PENTA AQ170B TRIPLE CARBS w/INTAKE B30
Glad to hear you're making some progress. The accelerator pump "circuit" I was referring to is the system of passages in the carb that are in play when you push the throttle forward and activate the accelerator pump. Any dirt or debris in those passages will make it hard for that system to operate. In other words, if it's gunked up, it won't squirt!
The Solex carbs aren't very complicated but don't tolerate plugged or clogged passageways. That's why it's so important to carefully clean all the passages during a rebuild.
If you're having trouble getting it to idle, it may be a vacuum leak. Use spray carb cleaner to check for leaks at the base and at all the gaskets on the carbs. Also check for slop arond the throttle plate shafts.
Three carbs seems cool if everything is working, but you're discovering first hand that it's no fun when it's not working right. All three need to be clean and working correctly since they're feeding two cylinders each. If the back carb isn't working right, it's just not going to run right.
You also need to verify that you've got fuel coming out of the standpipe in the center of each carb. You can take out that center screw (it's also a nozzle) and make sure it's ultra clean. If you look closely at the top, you'll see that it's got 4 small holes for feeding fuel into the venturi. They all need to be clear to allow fuel flow.
If you get the fuel system to the point to where you know it's working, you really need to look at the overall health of the engine. You need to have strong spark and at the right time, But if compression is low, then fire and fuel won't do much good if you don't have enough squeeze!
keep working it!
