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07 Honda 225 HP fuel pump help

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Bryan_destin_triton

Member
Hello all. Been a while since my last post because I’ve been able to fix most all problems with my motors till now. I was out on a fishing trip, ran about 40 miles and decided to slow down for a troll and my alarm went off. Turned the motor off to try and clear the alarm and the motor would not start. It would crank but not run. So I thought like most and said fuel or spark!?

Got it home and checking everything through the electrical system and the fuel system. The electrical was good but a further inspection of the fuel system brought me to the high pressure fuel pump. The LP pump, fuel cut off, and screens and filters are good. Still baffled that I can hear the HP pump operate and still not getting fuel. So, I took the HP pump and submerged the bottom in fuel and connected power, carefully of course, and ahhhh hahhh...... my problem.

My HP pump is spraying fuel out of the small hole above the plus symbol instead of the main port that feeds the HP filter and then the rail. Satisfied, I thought I found the problem, I bought a new fuel pump and replaced all the proper o-rings along with the new install. Got it all back together and the boat ran great for about 30 minutes. I let the boat idle at the docks and the alarm sounded again. It was starving for fuel once again. Turned the motor off and back on and it barely started. Was able to get it to the ramp and turn it off to go get the truck. Got the truck down and then that same motor wouldn’t start again.

Once home one I took it all back apart amazed that I could have the same problem. Once apart, a test of the HP fuel pump resulted the same issue. Fuel coming out of the small hole above the plus symbol instead of the main port. (See pic)

What could be causing my HP fuel pumps to clog the main port???

This seems crazy.

Was as wondering if it had anything to do with the fuel pressure regulator?

Any help would be appreciated. Thanks!

pic coming. Having problems
 
Here’s the pic.

the fuel is blowing out of the small hole to the left of the main port.
 

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Did you remove the pump from the plastic insulator when you tested it? If not, then do so and thoroughly inspect the fuel screen on the bottom of the insulator.

I don't know exactly how those things work inside - could be impeller type or roller vane. I'm guessing here, but the pump should have some sort of check valve and relief valve system inside. I suspect that is where the problem is. If I were in your shoes, I would disassemble the old fuel pump and take a close look at the innards, especially the check valve and relief valve. That may lead you to a solution, which unfortunately could be another fuel pump.
 
Also, consider going back to the seller and see if they won't send a replacement free of charge. These things shouldn't fail like that. Typically, they are very reliable.
 
chawk_man said:
Did you remove the pump from the plastic insulator when you tested it? If not, then do so and thoroughly inspect the fuel screen on the bottom of the insulator.

I don't know exactly how those things work inside - could be impeller type or roller vane. I'm guessing here, but the pump should have some sort of check valve and relief valve system inside. I suspect that is where the problem is. If I were in your shoes, I would disassemble the old fuel pump and take a close look at the innards, especially the check valve and relief valve. That may lead you to a solution, which unfortunately could be another fuel pump.
Click to expand...


Yes i removed that insulator to test it after. I took the new pump and installed it properly when it first came in. The boat ran great for the first 30 minutes. I really think that my problem is going to be the fuel pressure regulator at the end of the rail after the injectors. I think either this regulator is stopped up or the screen on the inside of this is blocked. It seems the pump is building up pressure and this hole to the left of the main pickup is a pressure release. Not sure. Taking a guess.

Thanks for your help CHawk
 
I'm guessing too, without more information. Could definitely be the fuel pressure regulator. I'm going to speculate that excessive pressure messed up the check valve on the top of the new fuel pump. I'm wondering if a probe down into the main outlet might get it to release.

BTW - another poster on this forum had a similar problem and after a real saga found that the fuel line going to the fuel rail got pinched by an incorrectly installed manifold. See posts on the thread: "Honda BF225 one cylinder not getting fuel." The whole thread is pretty educational.
 
Okay,lucky for some of you guys I have had some really bad Honda motors and "been there and done it before". I had the exact scenario burning out brand new fuel pumps @ $200 each. Boats. net will not replace them. What I suggest you do is buy them from boats.net thru Ebay. Ebay will offer you a 30 day refund. You mentioned that you replaced filters/screens?? Exactly which ones? There is one on the starboard side fuel line going into the vst. There is a high pressure fuel filter attached to vst. In the VST there is a screen that houses the HP fuel pump. Also very important is the screen that goes into the fuel rail on the top. Its tiny, but vital. If this is clogged it can burnout the pumps, as well as the strainer on the hp pump. While at it I would go ahead and replace low pressure pump. Were u able to get any fuel pressure reading from VST?
 
I took the Regulator off and actually tried to blow a breath through the side that attaches to the fuel rail. I couldn’t get any air through the Regulator and out either side of where the vent or the fuel tube attaches. So I assume this regulator is bad. I will find out tomorrow when the new regulator comes in I will try the same test.
 

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Bryan - not sure you should be able to blow air through the regulator. It is my understanding that if there is no vacuum on the regulator, the spring in there will close off the fuel return line altogether.

FYI - Quite a while ago I recall that a Forum member had a similar problem and found that the fuel return line was kinked, causing excess fuel line pressure.
 
chawk_man said:
Bryan - not sure you should be able to blow air through the regulator. It is my understanding that if there is no vacuum on the regulator, the spring in there will close off the fuel return line altogether.

FYI - Quite a while ago I recall that a Forum member had a similar problem and found that the fuel return line was kinked, causing excess fuel line pressure.
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Well got got the new Regulator and pump in and installed it all yesterday. Every filter/screen on this motor has been replaced, even the fuel rail screen. After I got all the vst assembly back in I detached the fuel line after the Regulator from the fuel rail and got around 2 fluid oz. that the book calls for.

Put the motor on muffs and it and it ran the way it was supposed to. Now the test will be if it continues to run fine!?

The last pump pump I put on did well for about 30 min and then quit. So let's hope for more than a hour run ahead!
 
Hey Fellas, going to get the side panels and all back together today after work and look to get out on the water tomorrow if the weather cooperates. Thanks again for all the help. I will keep you guys updated.

By the way, I’m planning on selling my 15 1/4” x 19pitch stainless props for these motors and replacing them with 15 pitch. Is there a section on this forum to maybe sell them?

Thanks
 
I would just start a new thread on this forum. I don't think anyone would object.

eBay is probably your best bet, although the last time I looked, which was quite a while ago, there were a ton of outboard props listed.
 
Well, I took the boat out today and ran it for an hour. Stopped and idled, ran full throttle, and stopped again. Changing the pressure Regulator seemed to work. Time will tell. We will probably plan on running only ten miles or so on the next trip to make sure.

Thanks again all all for your help
 
Had the boat out yesterday and ran it for another couple hours. The pressure Regulator must have done the trick.

Thank you you all for the help. Hopefully this helps someone in the future.
 
Bryan - good to know that. There haven't been many posts on this forum about bad fuel regulators, so this saga should be valuable to others.

Did you ever disassemble the old one? I'm wondering if there is yet another fuel screen inside there?
 
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