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Thread: ST1300 - Fuel Pump Replacement

  1. #1
    sennister's Avatar
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    ST1300 - Fuel Pump Replacement

    Tonight I replaced my fuel filter and while I was in there I tossed in a new fuel pump. The bike has 94000 miles and I had some bad fuel a while back and have been wanting to replace the filter. A member here mentioned another fuel pump option rather than the entire assembly option that Honda has for $400. The fuel pump motor in the ST1300 is a common automotive pump. I would post the link to ebay but it will be gone soon and just be a dead link the model number listed is:

    HFP-382

    A Google search of that will result in several options. The kit I bought off ebay was $68. Here is an example of the kit. (note over 400 vehicles use this pump)

    High Flow Pump

    The one problem with this option is the small sock that attaches to the pump pickup has to be reused. Honda doesn't sell this part. While I was in there I also replaced the Fuel Filter (16900-MBG-013); Filter, Fuel Return (16714-MBG-000) and when the assembly is removed you should replace the gasket (17574-MN5-000) which seals the fuel pump assembly. There are also some crush washers on the banjo fitting that could be replaced if you are ordering parts anyhow. I don't have the part number handy.

    There is already an article on fuel filter replacement so I will focus this on the fuel pump. It is pretty much the same process so I would recommend looking at both articles. Since the tools needed and the process for the removal of the assembly is documented there I will skip that part of the job. It is pretty straight forward.

    Ok I will start by saying that the towel is clean. Just stained. You do want a clean surface to work on.

    Here is the assembly removed.



    At the bottom of the assembly is a rubber boot that holds the Fuel Return Line Filter. This material is a stainless steel wool looking material. I have seen stuff for cleaning dishes that looks very much like this. I probably didn't need to replace it but it was cheap and I was ordering stuff anyhow.



    Here is a comparison of the old and the new. The pic didn't turn our that well.



    Once removed you can see the sock on the intake of the fuel pump.



    To remove the pump there is a single screw that holds a band around the pump. There is also a ground wire attached to this screw. Remove it and then straps will bend back. Also disconnect the power lead from the pump.



    Since I was replacing the filter and the pump I found it easier to remove them together and disconnect them separate from the assembly.



    Swapping the part was as simple as disconnecting hoses and reconnecting them. The sock is held in place by a friction washer. I popped off the old one and used the new one that came with the packaging. There wasn't an easy way to get a shot of that but it is pretty simple. As long as you have the pump and possibly the filter out of the way, now would be a good time to replace the gasket. You can do it at the end but it is easier to do it now at this point with the pump and possibly the filter out of the way.

    When reassembling make sure the return filter is where the return line dumps fuel back into the tank. Basically between that and the sock that has to get reused as seen here.



    Button the rubber boot back up and you are done reassembling the pump assembly.

    Here are some shots showing the old pump and the new pump side by side.

    New pump on top



    New pump on the Right. This shot is the intake of the pumps. The post in the middle are there for the friction washer to retain the pre-filter sock.



    New pump on the Right. This shot shows the output and the connector for the power.



    When I opened up the rubber boot on my pump this is the debris that was located on the pre-filter sock.




    Since it may come up, there isn't a real reason I am replacing the pump. I am having some issues with stalling where I wanted to replace the filter. At $68 I figured I might as well throw a new pump in as I have close to 100K miles on this pump. My stalling issue is more likely related to the fuel filter, fuel pressure regulator or vac leak which I will address if the filter doesn't resolve my stalling issue. The new pump comes with a new pre-filter sock but it will not fit in our application. Blowing on the old filter and comparing it to the new one showed that it was pretty restricted. The entire process was a little over an hour.

    Hope this option helps someone out there if there is a fuel pump issue.


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    Last edited by sennister; 07-06-2012 at 11:33 PM.
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  2. #2
    Will Ride for Pie okmurdog's Avatar
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    Re: ST1300 Fuel Pump Replacement

    Good pics & description...thanks for taking the time to put this together.
    -Mark


  3. #3
    This space for rent... Scooter's Avatar
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    Re: ST1300 - Fuel Pump Replacement

    Quote Originally Posted by sennister View Post
    Blowing on the old filter and comparing it to the new one showed that it was pretty restricted.
    It would be interesting if you could cut open the old filter to see what is in it. Just don't blow yourself up doing it...
    Scooter

    "If a nation expects to be ignorant and free, in a state of civilization, it expects what never was and never will be." - Thomas Jefferson

  4. #4
    Matt Kaminski UNTMatt's Avatar
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    Re: ST1300 - Fuel Pump Replacement

    So, does the new pump work as advertised?
    "Life is always a choice between greater and lesser risks -- zero risk is not an option." John Stossel
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  5. #5
    Does this dog look fast? BakerBoy's Avatar
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    Re: ST1300 - Fuel Pump Replacement

    Great job! +1 vote on seeing the innards of the old pump.
    John - 2004 ST1300A

  6. #6

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    Re: ST1300 - Fuel Pump Replacement

    Great write up. I was having issues with the bike stalling at idle when the temps are over 85 or so. I also had a major but inconsistent issue with fuel surging after a long run. It then became an issue after shorter runs. I checked hoses and replaced the filter but no improvement. The lower and upper tank were spotless.I found a used pump of a low mile wreck and replaced the whole assembly for about $90. So far so good after about 6K on the replacement. The bike now has 162K on the clock. Still chasing the stall at idle issue.
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  7. #7
    (Threadstarter)
    sennister's Avatar
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    Re: ST1300 - Fuel Pump Replacement

    Quote Originally Posted by Grizz117 View Post
    Great write up. I was having issues with the bike stalling at idle when the temps are over 85 or so. I also had a major but inconsistent issue with fuel surging after a long run. It then became an issue after shorter runs. I checked hoses and replaced the filter but no improvement. The lower and upper tank were spotless.I found a used pump of a low mile wreck and replaced the whole assembly for about $90. So far so good after about 6K on the replacement. The bike now has 162K on the clock. Still chasing the stall at idle issue.
    Have you tried to replace the Fuel Pressure Regulator? On mine I wanted a new filter. I am thinking it is either the filter or FPR.

  8. #8
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    sennister's Avatar
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    Re: ST1300 - Fuel Pump Replacement

    Quote Originally Posted by UNTMatt View Post
    So, does the new pump work as advertised?
    I still haven't ridden the bike other than down the driveway. Granted I have a pretty long driveway. So far I see no difference than with the OEM pump. I did bring the idle back down to 1000 RPM. I have been busy working on TwinPine's bike. Driving lights, brake flush, counter balancer adjustment, preload refill, hyper lights and speedo healer. I think that is all that we did.

  9. #9

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    Re: ST1300 - Fuel Pump Replacement

    Quote Originally Posted by sennister View Post
    Have you tried to replace the Fuel Pressure Regulator? On mine I wanted a new filter. I am thinking it is either the filter or FPR.
    Not yet. Do you think that would be a temperature sensitive component? BTW - Back when I replaced my filter I cut it open and it was spotless too.

  10. #10
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    Re: ST1300 - Fuel Pump Replacement

    Quote Originally Posted by Grizz117 View Post
    Not yet. Do you think that would be a temperature sensitive component? BTW - Back when I replaced my filter I cut it open and it was spotless too.
    Not sure if it would be temp sensitive. I guess the temps have been over 85 or so when I get the stalling as well. It has mainly stared with warmer weather. One thing I did to stop the stalling until I could try the fuel pump replacement was to bump up the idle. I went up to 1500 RPM. I could have likely gone lower but it ended the stalling.

    I plan on cutting open the filter. I wanted to let it dry out for a day or two. Maybe tomorrow.

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