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2010 Bf150 possible fuel starving?

C

codycat

Member
Hello,
I have twin 2010 BF150s on my boat, I have not owned them for long. I've put about 80hrs on them. They have 1200 hrs, but new power heads at 1050 from previous owner with receipts.

I noticed the last few offshore trips, the port motor would act like it was running out of fuel. It would do it when I am cruising, usually after about 5-10 miles of running at 4400-4500 rpm. It would stutter and drop rpms for a few seconds like it was running out of fuel. It would work itself out and then run perfect the rest of the day. (100+ miles) afterwards. I replaced the water separator filter and high pressure filter on the motor, it still did it. I began to think it was the squeeze ball.

In March I replaced the fuel tanks on the boat (planned to do it when I bought it) all new fuel lines and squeeze ball. Honda OEM squeeze ball. Just took it out yesterday, and sure enough it still did it. After 5-10 miles it started to drop rpms and stutter. I adjusted the throttle and it went back to 4500r rpms and ran great the rest of the way offshore. 50 more miles. Trolled for a few hours and when I went to move locations to bottom fish at speed, it did it again, but recovered, and not issues after that, even with stopping and going as we made our way back in.

I was thinking last night, it's gotta be the VST, so I pulled it all apart just now, and everything seems clean in it. I drained it first into a clear container and I'm not seeing any water or sediment.

Could I be looking at a low pressure fuel pump issue or high pressure?

It runs great other than the stutter, and then flawlessly afterwards.

Any help or direction would be appreciated!
 
I should add that when I changed the high pressure fuel filter, I blew in it with my mouth and could feel restriction. But then when issue still persisted I assumed it was the squeeze ball
 
So, I made my original post before I removed the fuel pump holder. This is what it looked like.

It won't let me attach a picture. But the screen on the fuel pump holder was nasty.

It cleaned off easy with carb clean.

Could that have been my problem?
 
Hi, just a guess but it might be the file is too large. Downsize the file to 60 percent and try it.
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1000003262.jpg
 
Obviously it's got alot of gunk on it, but I would have thought it would have created more of an issue than just for seconds then went back to normal. It sprayed of with carb clean very easily
 
Well, you never know. And....that's a huge improvement in my O.

I'll be interested to see how she does now.

Any idea where all that came from? You may have made a VERY wise choice changing out those tanks.
 
I'm guessing it was 25 yrs of stuff in the old tanks. I have no idea if the vst has ever been cleaned before.

I bought the boat knowing fuel tanks were in my future. Luckily, the boat had removable hatches, so no fiberglass repairs needed.

I'm just amazed that if this is the issue, that it would only act up for seconds, and then run fin the rest of the day.

The only way to know for sure is to try it. Luckily I have twins, so if this isn't the issue, I can still make it back.
 
Well, you may still have some issues....
....but hopefully not.

If you're lucky, that crud didn't make it to the fuel injector screens. If you still have problems you may be looking at getting the injectors serviced or buying new ones. Just a guess though.

Watching with interest.

Good luck.
 
jgmo said:
Standing by....fingers crossed🤞
Click to expand...
Well the parts won't be in till right after mother's day. I'm planning an offshore trip for the following weekend. But I was gonna run it at the local lake before just to test it out, but the real test won't be till I run it offshore.

I'll definitely follow up
 
So all the parts came in this weekend. Got it all back together, and then took it to the lake a few minutes from my house to test before I go offshore. Everything ran fine. Wasn't expecting it to act up as it never has done it at the lake, but just wanted to make sure i had everything together correctly. Hoping to get a good forecast this weekend and make an offshore run.
 
Went 55 miles offshore today. On the way out and all day it ran flawlessly. However on the return trip it started to studder again. But this time it didn't drop as many rpms. Before it would drop 1500rpms, today only varied about 500rpms around the 4000rpm range. If I bumped it up to 4600, it smoothed right out.

I think it's fuel injector time. I'm gonna check the vst tank again, but I feel like something made it's way to the injector.

I order new injectors to at least get them coming
 
Removed the vst today. The screen on bottom of high pressure fuel pump was clean, as was the tank. No debris came out with the fuel from the tank.

I have a new high pressure fuel pump on the shelf I'm going to put in since I have it all apart again.

New fuel injectors arrive tuesday.
 
Any updates? I have a 150 and replaced the head. Runs great but usually the first throttle up when it get to 4000-4500 it drops back down to 2000 then I throttle back and throttle up and it’s fine. Doesn’t do it all the time and usually only at first throttle up or after starting when it sits. I’m guessing something with the V tec but really haven’t gone thru it yet. Runs fine otherwise. Idles smooth as well.
 
Mark45636 said:
Any updates? I have a 150 and replaced the head. Runs great but usually the first throttle up when it get to 4000-4500 it drops back down to 2000 then I throttle back and throttle up and it’s fine. Doesn’t do it all the time and usually only at first throttle up or after starting when it sits. I’m guessing something with the V tec but really haven’t gone thru it yet. Runs fine otherwise. Idles smooth as well.
Click to expand...
So now I actually don't think it was my VST at all. It definitely needed to be cleaned as evident by your photos. I went offshore Thursday, Friday, and Saturday this weekend.
On Thursday, the first trip since the injectors, it did it right away on the way out. But if I adjusted the throttle a little it was fine. So coming back in, I discovered it really only did it between 4000-4400 rpms. On the way back in, if I kept just a little bit of pressure with my finger on the port throttle it ran fine, so friday morning I adjusted the tension on the throttle.

On Friday, it did it again. However I noticed when it did it, my trim gauge on port motor went all the way down, and the volt gauge bottomed out. So when I got back to port, I removed the cover and inspected the wires, and found a spot where the sheathing was rubbed raw, down to the colored wire, so I wrapped it with electrical tape but didn't want to inspect it too much and possibly have an issue Saturday as it was a Military Appreciation event, and I didn't want to mess with it too much.

Saturday, I felt it only happen once possibly, but the seas were much calmer, so I wasn't running in that rpm range.

I really think it had something to do with my trim wires, or throttle position. I just got home from the coast, and may have time to disassemble the throttle handle tonight and remove the engine cover and make sure there is no wires being rubbed inside the engine against the throttle.

Any thoughts if I'm in the right direction?
 
So I am at a loss now. While flushing the motor, I decided to remove the cover and my electrical tape to look at it further.

The wire that had wore through the sheathing was actually for the starboard side. Not the port motor.

Any thoughts jgmo? Or any body else? Any help or insight would be greatly appreciated

Here's the run down now
Motor studders between 4000-4400 rpms. Runs flawlessly for any other range.
I've ran it for hours at 3900 and hours at 4500-4600 and no issues......
On last trip, I observed the voltage meter and the trim gauge bottom out while motor stumbles.

I am leaning towards a short somewhere, I really suspect it's in the lever meters. Either the switch itself, or the wiring is broke inside the sheath.

I don't know much about the V tech since the last poster brought it up
 
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