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2.5L 280 Fuel issue

Discussion in 'The Outboard Church' started by Brooks D'Antonio, Sep 5, 2019.

  1. Brooks D'Antonio

    Brooks D'Antonio Well-Known Member

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    Hey guys, I had a random fuel issue with my 280 over LDW. The boat fires up no problem and gets on plane but every now and then the motor would shut down. As soon as I can feel it about to happen I would chop back on the throttle and it would continue. Each time the boat shut off it would always start back up and sounded healthy.

    My first thought was maybe there had been air in the lines. I did my best to take off the return line, turn on the fuel pump and key to try and purge the air out. Everything seemed ok, but continued to have the same issue.

    Before summer I had my injectors cleaned and flow tested so I’m not sure that is the problem.

    I went through each fuel line and nothing seemed cracked and did a sanity check to make sure each hose clamp was tight. Does anyone have any idea on what could be causing this? Fuel pump, fuel pressure regulator, fuel filter?

    Any help is greatly appreciated. Thanks in advance.

    BD


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  2. hallett21

    hallett21 Well-Known Member

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    Fuel pump starting to die? Change out fuel filters?


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  3. Brooks D'Antonio

    Brooks D'Antonio Well-Known Member

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    Could be a possibility, was thinking that over the weekend. It seemed strong when I pulled the line off the return and tried to purge any possible are out. I haven’t changed the fuel filters out yet, but was planning on that for peace of mind.


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  4. hallett21

    hallett21 Well-Known Member

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    The throttle chop would allow you to recover? Or it would still die?


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  5. Brooks D'Antonio

    Brooks D'Antonio Well-Known Member

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    It would allow me to recover briefly at times but shortly continued to be inconsistent.


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  6. Riverbottom

    Riverbottom Well-Known Member

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    I would also inspect the coast guard anti siphon check valves in the fuel pickups on your tanks. I have had these go bad or stick on more than one boat, and starve the engine for fuel.
     
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  7. Brooks D'Antonio

    Brooks D'Antonio Well-Known Member

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    I’ll check those, thanks for the info


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  8. BajaMike

    BajaMike Well-Known Member

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    I didn’t see what engine you have. Fuel or Fire? If the fuel system seems ok, how about the computer? Can’t you have that scanned?
     
  9. STV_Keith

    STV_Keith Well-Known Member

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    As mentioned, check the tank/pickups, change the fuel filter. There isn't going to be air in the lines in a return style system. Does the return plumb back to the tank or to the fuel filter/separator? I have seen the filter housings crack and allow air in/fuel pressure out.
     
  10. Brooks D'Antonio

    Brooks D'Antonio Well-Known Member

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    It’s a 99 Merc 2.5L 280. Fires up just fine each time, just getting inconsistent fuel to the motor it seems. Almost like air in the lines.


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  11. Brooks D'Antonio

    Brooks D'Antonio Well-Known Member

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    Gotcha, thanks for the response. It is a return style system like you mentioned. The return plumbs back to the fuel filter/separator. I was going to take the filter off last weekend but didn’t have the right tools where I was at.


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  12. gqchris

    gqchris Well-Known Member

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    BOAT2.jpg

    Do you have a Fuel Pressure gauge in the dash Brooks? I have one and it remains at 55 all the time. If I ever see it deviate I know I got a pressure problem.

    Here's a pic of the pump on my 300 in case it helps any. Is yours the same style?
     
  13. GETBOATS

    GETBOATS Well-Known Member

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    ELIMINATE THE BOATS FUEL SYSTEM, RUN IT ON A PORTABLE FUEL SUPPLY, THEN YOU'LL KNOW IF YOU HAVE A MOTOR ISSUE OR BOAT.

    Once that has been established, a vacuum gauge can help if its the boat, a pressure gauge if its a motor pump issue

    all the above are good ideas, but guesses. let the evidence be your guide
     
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  14. Brooks D'Antonio

    Brooks D'Antonio Well-Known Member

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    I don’t have a fuel pressure gauge in the dash, but would be helpful. I was going to install an adjustable fuel pressure regulator so I can see exactly what I’m getting. Thanks for the pic/response.


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  15. stoker2001

    stoker2001 Well-Known Member

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    maybey a temp fuel press test gauge in between rail and pump so you can moniter it while running.280s have the 39PSI gold regulater.If it dies with good pressure then I would be looking at ECM box
     
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  16. gqchris

    gqchris Well-Known Member

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    Brooks you ever figure out what was the problem?

    Chris
     
  17. Luv2gofast

    Luv2gofast Well-Known Member

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    Be careful about running that motor out of gas. I toasted a piston trying to nurse mine back to the ramp with an empty tank. I would for sure get a temporary gauge on it that you can see while driving to find out if it's got a pressure problem.
     
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  18. Brooks D'Antonio

    Brooks D'Antonio Well-Known Member

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    To be honest the past few weeks I have not had the time to dig into it. Later in the week I plan to tear into it and squeeze some more river trips before the cold weather comes in. I'll keep you guys posted with what I find. Pretty confident with all the comments I'll be able to figure it out.

    BD
     
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  19. Brooks D'Antonio

    Brooks D'Antonio Well-Known Member

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    I'm always super cautions of that happening. I've had that happen to a few buddies. I had two full tanks when this happened to me.
     
  20. HST4ME

    HST4ME Well-Known Member

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  21. Brooks D'Antonio

    Brooks D'Antonio Well-Known Member

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  22. H20beater

    H20beater Member

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    My 260 did the same thing it ended up being a bad Ecu!
     
  23. Brooks D'Antonio

    Brooks D'Antonio Well-Known Member

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    Dumb question, but how did you test the ECU to see if it was bad?


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  24. H20beater

    H20beater Member

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    I talked to Joe at DBR explained what was going on he told me right away ecu was bad so I replaced it and ran great again!
     
  25. Brooks D'Antonio

    Brooks D'Antonio Well-Known Member

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    Right on! Thanks for the info dude! I was planning on calling Joe tomorrow.


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