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Fuel problems

Discussion in 'Compact Excavators' started by Tradesman, Jul 23, 2018.

  1. Kiwi-truckwit

    Kiwi-truckwit Well-Known Member

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    Presumably you connected the remote tank before the injection pump? If so, and it ran fine like that, then the problem lies between your connection point, and the tank. And if you've cleared the lines, that leaves the lift pump.
    I'm no diesel mechanic, but that's the conclusion I'm drawing.
     
  2. thepumpguysc

    thepumpguysc Senior Member

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    What kiwi said..
    Really depends on WHERE you hooked the bottle up to.. did you run it before the lift pump & let the lp push the fuel up to the inj. pump??
    Or did you run the bottle right into the back of the inj. pump & let gravity do the pushing??
    Did you run the bottle fuel thru any of the filters??
    My thinkin is, you got to many filters & not enough lift pump..& your starving the inj. pump..{poor little thing,Lol}
     
  3. Tradesman

    Tradesman Senior Member

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    Ontario
    update , I have a new after market pump on the way , I tore the old one apart hoping for an awhaw moment but there where no big chunks of dirt in it, the only thing might be that the diaphragm looked like it might be a little dried out. As well I was helping a friend out on the week-end and he suggested to first put the pick up line directly into the fuel tank to eliminate any fuel line problems from pump to tank and check the tank vent, he said when it was starving out after 15 minutes the tank might not be venting. I should get the pump tomorrow and hopefully I can get it back on line tomorrow night, I would like it back to work the end of this week.
    Thanks for all your help and suggestions.
    PS. you would likely be entertained watching a carpenter lying on his back under this little machine cussing at it like it understood.
     
  4. thepumpguysc

    thepumpguysc Senior Member

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    Lol.. The only people that cuss more than a carpenter/framer>> is their wives.. Lol
    I sure hope you get this figured out.. Do you have any links as to the pump you bought?
    Not all pumps are equal.. some put out more pressure than others.. & that's not always a good thing, depending on the pump model..
    YOUR PUMP only requires 1-3psi at the pump inlet.. you would be ok w/ say, 10.. but anything over that & your asking for trouble..
    Its strange.. the LOWER you go on the psi scale, the more expensive the electric lift pumps are.
    You might say to yourself, 1-3psi aint sh*t.. Well, your right.. BUT its the VOLUME of fuel at the inlet..
    The lift pump is supplying the VOLUME of fuel.. & when its weak or not working, the inj. pump cant PULL the fuel it needs, all the way from the tank, thru all those filters.. especially if they're dirty or clogged.. {get it?}
    That's why you see a lot of threads about> it runs good at IDLE but when I put a load on it or move the throttle, it dies..
    It takes VERY LITTLE fuel to IDLE a motor.. it takes ALOT of fuel to RUN one..
    On YOUR machine, it only takes 8-11cc's of fuel to idle.. it takes 65cc's to run it at full load..
     
    Last edited: Aug 8, 2018
  5. Birken Vogt

    Birken Vogt Charter Member

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    I had one of these with a bad lift pump, way, way out in the woods. I blocked off the injection pump constant bleed line, bypassed the lift pump with a piece of hose, and had it running where the injection pump was directly pulling from the tank about 4' below itself.

    It ran this way starting and stopping as needed for a couple weeks until we could get back out there. It was a little low on power, stationary generator set.
     
  6. thepumpguysc

    thepumpguysc Senior Member

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    I got confused w/ my "helping" again..Dammit.. this seems to be happening a lot lately..
    Its either ME or everybody is taking to dam long to fix their crap.??
    The supply fuel should be in the 10psi range for that little PFR pump.. not the 1-3 psi range.
     
  7. thepumpguysc

    thepumpguysc Senior Member

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    Well, I just looked.. It aint me.!!! {Thank God} July 23rd is when this thread started..
     
  8. Tradesman

    Tradesman Senior Member

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    Yehaw! Got the new pump in, worked the crap out of it for 15 to 20 min at a higher throttle than I normally run, it seemed good. I’m not sure if I am imagining or not but it maybe had a little more zip than normal, I guess it would if the pump was failing.
    I would have liked to put it to work on a real job for a couple hours first but a friend that I trade favours with needed it to dig some footings in his barn so he picked it up just after I got it back together, best thing is he is a Diesel mechanic, and runs around 20 cattle pots, so if it gives trouble it’s at a good place.
     
  9. Tradesman

    Tradesman Senior Member

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    Occupation:
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    Location:
    Ontario
    My normal day starts at around 6:30 am. I take 1/2 to 3/4 of an hour for supper then generally get back to the house between 8:30 and 9:00 pm. Doesn’t leave a lot of time for screwing around with a piece of equipment I use only occasionally.
    I do appreciate the help from all on here to help me diagnose the problem, I’m just glad it was on the cheaper end of the fuel system.
    I normally have a mobile tech. fix my equipment and he is good to get me going when it’s critical but he knew this wasn’t a rush job and wasn’t giving me much help.
     
  10. Birken Vogt

    Birken Vogt Charter Member

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    No mechanic wants to work on a sucking air fuel pump problem, they are the worst, as you discovered.

    I had one a couple months back, customer kept bringing it back, turned out he was running it low on fuel tilted away from the pickup on a long low flat fuel tank. I told him to tilt it the other way or fill it higher and never heard about it again.