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 Post subject: Need help bleeding a Cat Backhoe diesel line
Post Posted: May 18, 2016 8:53 am 
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I have a 426b that I had to change out the filter /separator and clean out the fuel bowl.
The instructions in the manual are smarter than I am. :bash:
Any suggestions or can someone show me - gas money and beer if that helps
Top of Shadow Mountain off Black Mountain Road.

Thanks
Michael 303-903-4919

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 Post subject: Re: Need help bleeding a Cat Backhoe diesel line
Post Posted: May 19, 2016 4:54 am 
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Pressurize the fuel tank with an air compressor, which will force the fuel and trapped air through the fuel system.


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 Post subject: Re: Need help bleeding a Cat Backhoe diesel line
Post Posted: May 19, 2016 8:35 am 
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could you post a pic of your filter/separator?
usually filters are pretty simple to change.


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 Post subject: Re: Need help bleeding a Cat Backhoe diesel line
Post Posted: May 19, 2016 8:43 am 
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sorry, I misunderstood...
you're trying to bleed it?

basically you just need to start at the tank and open up any bleed screws (one at a time) from the tank to the injectors. for mine, I just opened the bleed bolts on my injection pump, pumped a bunch of fuel through, and then same at the injectors (don't necessarily need to do all of them, but couldn't hurt). some fuel systems seem to be more sensitive to air in the lines than others. I actually had to do mine a number of times before it would start. I also installed a bulb type pump on mine. the stock manual fuel pump (a lever on the lift pump) hardly moved any fuel at all.


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 Post subject: Re: Need help bleeding a Cat Backhoe diesel line
Post Posted: May 19, 2016 10:30 am 
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The Separator is the one on the fuel pump side, I changed that one and had no problems, it ran fine for 2 days. The fuel inspection bowl is the glass bowl on the gas tank side, cleaned all sorts of crud out of the bowl, but since it is a 3 part bowl, there is no way to fill it up and re-install. Can't find the bleed screws along the way - the manual pump is in a crappy place to reach, but it seems like it isn't pushing fuel into the bowl, even though I can hear it blowing bubbles in the fuel tank.

Thank you for all the feed back.

Someone said pressurize the fuel tank, how to do that? is there a back side vent tube?

Thanks

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 Post subject: Re: Need help bleeding a Cat Backhoe diesel line
Post Posted: May 19, 2016 4:48 pm 
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Pressurizing the tank should help you as Mile high dowser said. Grab some clean rags or a t shirt, remove the fuel cap. Use a blow nozzle from your air compressor to pressurize the tank using the rags to create somewhat of a seal. Thus allowing you to pressurize the tank pushing fuel to your filter. Once you get fuel to your filter you may have to crack injector lines at injectors (use two wrenches so injectors don't come loose) just crack the lines a bit so fuel can escape but it won't take many turns to tighten. Crank engine. Once nut starts spraying tighten. It should start running/missing. Tighten rest of nuts.let it run to smooth out. And your done sounds easy right.Also
I would look into a filter housing upgrade, I've done it on quite a few old pieces of equipment.way better!


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 Post subject: Re: Need help bleeding a Cat Backhoe diesel line
Post Posted: May 20, 2016 6:26 am 
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thanks all for the suggestions, will give it a try this weekend - since its NOT SNOWING

Thanks 'Cammers

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