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Hi Scott, my name is***** you say everything is brand new are you talking about the trim pump assembly itself? Is the entire trim assembly brand new?
Okay so the whole trim unit isn't new, only part of it, correct?
How exactly are you trying to bleed it?
Okay you are doing everything correctly. That is how you bleed it.
Well, let me ask you a couple of questions back. First, what year is the motor. 2nd, how much time in hours do you have into this trim system so far from start to where you are now?
The reason I asked is because in the shop we do not rebuild trim units. And we do not do it for a couple of reasons. The first is Honda does not teach you how to do it. I am Honda certified and have been through the classes, but they do not teach you how to rebuild trim unit. (This isn't anything Honda specific, I'm also Mercury certified and Mercury doesn't teach you either). There are some very basic and very rudimentary instructions in the service manual, along with a basic flow chart, but it doesn't actually tell you what to look for except for more or less saying check everything and if it doesn't work replace the trim assembly. Because of those reasons it's simply not cost effective in the shop to try and bother rebuild one. A new unit is about 1200 bucks. A mechanic could spend 6 or 7 hours futzing with a unit and throw a hundred or two into parts at it and in the end there is a very good chance the unit still would not work. Somebody has to pay for that mechanics time. Because of that, there isn't any point in even trying to rebuild the unit. If you want it I can certainly give you a copy of what is in the service manual and you can see if you can get anywhere with it. But other than that if you want this to work the first time you would want to get a new or used unit. Does that all make sense?
The correct way to bleed is to open the manual relief screw. Lift up by hand. Set on the trailer lock. Fill the reservoir until it overflows. Put the reservoir cap back on. Drop the engine down. Close the manual relief screw. Hit trim up and see how far the motor lifts up. Then repeat over and over. The actual filling of the unit can take some time as the unit does hold quite a bit of trim fluid but you can only fill it a few ounces at a time. Aside from that, I will give you what is in the factory service manual that way you run through the flowcharts and see how far you want to tear this thing down. The manual does say BF35/BF45 on the upper right but this also covers the BF50 engine (It's the same trim unit, you'll see it in the pictures). See attachment.
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Thanks and good luckJason