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Honda BF150 fuel issue?

Old 05-27-2019, 09:31 AM
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Default Honda BF150 fuel issue?

Finally got her back in the water. Idle and slow speed seem fine. When I get up on a plane, about 3800rpm it will run ok for a minute or two then stumbles, and sllows down a lot. Fuel starvation? Water In gas? Trying to diagnose it while Iím in the water. Any ideas? Thanks!
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Old 05-27-2019, 11:50 AM
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Originally Posted by Marathon196CC View Post
about 3800rpm it will run ok for a minute or two then stumbles, and slows down a lot. Fuel starvation?


yes, could be the low pressure fuel system is not able to keep the Vapor Separator Tank full
or the high pressure system is restricted or clogged

Are you able to get to the primer bulb while running?
See what if any difference it makes,
to pump the primer bulb when it gets to that 3800 rpm stage.

Are you able to pump fuel until the bulb feels firm (the VST is full) ?
and if that makes the engine run fine - then the problem is with the low pressure system

If you keep the VST full, but that doesn't help -
there may be a problem with the high pressure side
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Old 05-27-2019, 12:08 PM
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Lots of times this time of the year it isnt unusual for something (wasps, etc) to mud up the inside of the vent to the tank...make sure that it is clear...that will give you the problems you are having.

Also, if you unscrew the fuel/water separator and pour the contents into a quart glass jar and let it settle, you will have an idea of the makeup of the fuel going to the motors.
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Old 05-27-2019, 12:32 PM
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Interesting. When I went to start it (after it sat for a month), I noticed the bulb never felt firm, although I pumped it about 12 times (which is a lot more than usual). I wasnít sure it would even start. I knew from that moment it would be a troubled day trip. Thanks for the replies!
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Old 05-27-2019, 01:17 PM
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i have honda 150's. sounds like the high pressure fuel filter
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Old 05-27-2019, 06:09 PM
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So, Iíve read a number of posts about people changing these low and high pressure filters themselves. Anyone have a good link to some step-by-step instructions or a how-to video?

thanks!
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Old 06-02-2019, 05:25 AM
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Bump to hopefully get more info. Anyone have part numbers for a 2006 BF150 low pressure and high pressure filters? Instructions for replacing these filters?

Is it possible that the bulb has collapsed? It was flat when we launched, and stayed flat even after I pumped it 12+ times to start the motor.

Thanks!
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Old 06-02-2019, 06:13 AM
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Originally Posted by Marathon196CC View Post
Is it possible that the bulb has collapsed? It was flat when we launched, and stayed flat even after I pumped it 12+ times to start the motor.


I'm not following that.
if it was flat - how did you pump it 12 times?

to me, 'pumping' means that it was its full normal shape,
I squeezed it flat -
and then it returned to its full shape.

if it 'stays flat', yeah, that could mean the rubber has lost its elasticity

but more likely, means a restriction between the bulb and the fuel in the tank
or a lack of tank venting
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Old 06-02-2019, 06:31 AM
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Originally Posted by Fwpratt View Post
I'm not following that.
if it was flat - how did you pump it 12 times?

to me, 'pumping' means that it was its full normal shape,
I squeezed it flat -
and then it returned to its full shape.

if it 'stays flat', yeah, that could mean the rubber has lost its elasticity

but more likely, means a restriction between the bulb and the fuel in the tank
or a lack of tank venting
Bulb was about half itís usual (bulb-shaped) volume. Worth noting that it had not been run in over a month, and that was just idling on the earmuffs. It had not been up on a plane since late December.
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Old 06-02-2019, 01:45 PM
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Originally Posted by Marathon196CC View Post
Anyone have part numbers for a 2006 BF150 low pressure and high pressure filters?
16911-ZY3-000 high pressure
16901-ZY3-003 low pressure

FP
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Old 06-02-2019, 07:16 PM
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Originally Posted by Fullpower View Post
16911-ZY3-000 high pressure
16901-ZY3-003 low pressure

FP
Thank you! Do I need anything else (o-rings?) when I change these filters?
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Old 06-02-2019, 08:18 PM
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If the bulb is flat then maybe your tank is not venting. Unscrew your fuel tank fill cap and see if that lets the bulb take shape. If so then your vent is clogged if not then I would look at your anti siphon check valve. You can google that to see what it looks like. Most are aluminum as opposed to the usual brass barb fittings.
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Old 06-03-2019, 01:04 PM
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Take a look at your fuelhose. I had the same proble and after changing the pump filters, and water separator, the culprit was the fuel hose wich had colapsed internally due to the ethanol in the gas. It manifested itself as smal dark glass like particles , they looked also like rust, in the clear in line fuel filter. It drove us mad for months, at high rpms the bulb woud colapse and the engine sputtered.I hope this helps.
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Old 06-04-2019, 04:58 AM
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Thanks, everyone!

Lots of things to check. I won't have time to check anything until Friday, and unfortunately the boat is at the marina, not my back yard.
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Old 06-04-2019, 07:09 AM
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This may help.


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Old 06-05-2019, 11:57 AM
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Terrific! Thanks for the shop manual diagram! Time to order some filters!
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Old 06-12-2019, 10:34 AM
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OK, a few more questions:
If it is the anti-siphon valve, is that something I can safely change myself?

Anyone with a Marathon 196 happen to know what size the anti-siphon valve (1/4 or 3/8?) is?

My boat seems to have the vent that is integrated into the fill cap. Is there an anti-siphon valve in the filler that could be the issue?

Thanks again for all the responses and ideas!
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Old 06-12-2019, 10:53 AM
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The anti-siphon valve is typically on the tank where the fuel line connects. It can be straight or a 90 degree angle. They can cause issues. The integrated fill/vent fittings have been know to cause issues too. Try running with a separate 6 gallon tank to see if you can eliminate the problem and then isolate the issue.
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Old 06-18-2019, 03:36 PM
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Ok asking for help again, still trying to track down the fuel issue. I removed the Racor filter after draining about an ounce of liquid from the sea thru bowl, but the filter had NO gas in it. Squeezing the bulb does not seem to be pulling gas from the tank. Opening the filler has no effect on any of the above.

In the pics attached, Iím trying to identify parts. Bigger pic seems to be sending unit (silver), tank fill (lower right), and fuel line to Racor(?)(left).

Antisiphon valve?



Smaller pic (Index finger) looks like antisiphon valve(?).

What is the line that runs horizontally thru both pics?

I bought antisiphon valve, Racor filter, and high and low pressure filters.

Antisiphon valve?
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Old 06-18-2019, 03:46 PM
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yes, that is the anti-siphon - a hose barb with an attitude.

Name:  antisiphon.png
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the gray-ish 'hose' passing through isn't part of the fuel system
perhaps a drain hose - from a floor hatch gutter or compartment
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