Question about Caterpillar E70B Excavator

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E70b excavator starts to miss under load

It will eventually quit. I have replaced the fuel filter. I removed the fuel line from the primer pump and let it drain a little. This seems to help for a while but then the same problem comes back.

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Sounds like the mold that grows in the tank between the layer of diesel fuel & the water is clogging your fuel line. This black mold will clog up the fuel line valves, the fuel lines & any filters. Shut the valves off & blow out the lines if there is any evidence of black gooky stuff. If you have it you will have to drain the tank also. Once the tank is clean & clean fuel added, add the anti-mold fluid found in parts stores.

Posted on Oct 26, 2013

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Hi have u tried breaking the fuel line after the primer pump 2 see if u hav a strong flow using the pump. If not u might hav blockage at bottom of fuel tank and it may require clean out?

Posted on Jan 10, 2013


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Have you replaced all three filters under the cowling?
1. Primary Filter (1st one in the Plastic Bowl)
Reference # 12 in "Prim Fuel" Image
2. Screen on the bottom of the Fuel pump-Inside the VST
Reference # 27 in "VST" image
3. Filter between the VST and the HPDI Pump
Reference # 19 in "VST" Image

Number 2 and 3 get overlooked often, and they are pricy, but they do need to be changed.
If that has been done, the problem most likely is in the fuel pumps
Reference # 24 in the "Prim Fuel" image.
The can be tested by removing them from the powerhead, DO NOT remove the fuel lines, just unbolt them from their mounting leaving the fuel lines attached. Then squeeze the primer bulb until firm. If fuel leaks from the center hole on the fuel pump, Replace them both.
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This particular JD engine has an individual fuel pump for each cylinder. The injectors, fuel lines, and pumps are not accessible from outside of the engine. There is a hand primer pump built into the top of the fuel filter. Start by removing the rubber outlet line from the filter base and pump the primer pump until fuel come out of the filter base outlet. Ounce fuel comes out of filter reconnect the line and continue pumping by hand until the pump button feels solid, then crank engine until it starts. This works better if a helper is available to operate the starter while continuing to pump the hand primer. This is normally all that is needed after running out of fuel.

If fuel does not come out of fuel filter base there may foreign material inside of primer pump. Primer pump can be disassembled and cleaned. If fuel comes out of filter, primer pump become feels solid but engine does not start the fuel control rack inside of engine may be sticking in the off position. This may sometimes be overcome by clicking the key switch from off to on rapidly. If not you may have to have your dealer remove the governor cover to free the rack.

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Aug 11, 2012 | Caterpillar E70B Excavator

1 Answer

Model # 358.797180, 200 mph. At first I thought problem was carburetor being gummed up due to being improperly winterized by previous owner. Replaced carb with new, did not fix problem. Also replaced fuel...

The primer is just a small pump that is supposed to pull fuel through the carburetor from the tank supply line/fuel filter. The filter is supposed to be connected into the longer line at the rear of the tank. This lines goes to the carburetor uppermost port and the lower port is tied to the inlet side of the primer pump. Remove the tank side line from the pump during the pump test to make sure that you are not pulling fuel into the pump from the exit line. Try pumping fuel at this point--if nothing happens, swap the port connection at the pump and try to pump again--when correct, it will fill the tank supply line first, then the exit line from the carburetor that goes to the pump and finally fill the bulb. If you don't get fuel with either connection, then you have a leaking fuel line somewhere as you have already replaced the carburetor. Most saws use a rubber fuel line, not clear plastic. Hope some of this helps!

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1 Answer

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Two lines come from the tank--one with a filter that goes to the carburetor, another with no filter which goes to the output side of the primer bulb and passes pumped fuel back to the tank. Connect only the line with the filter on the end to the primer and pump it. If nothing happens, switch the line to the other port on the bulb and pump again. With fuel mix in the tank, one of these two ports should pull fuel into the bulb. When correct, put the filter-less line on the other port of the bulb. Remove the filtered line from the bulb and hook it to the upper fuel connection on the carburetor. Use another length of fuel line to connect the now open port of the bulb to the other port on the carburetor. If the connections on the carburetor are correct, fuel will fill the bulb after a few pumps. If nothing happens, reverse the two connections at the carburetor and try to pump again. You should see fuel enter the bulb with only the correct connections at the carburetor. Usually, these connections are unidentified and must be found by trial and error. This is also a good reason for replacing only one line at a time! When fuel pumps into the bulb, attempt to start--with luck, the engine will run. Once the engine runs normally, trim the line lengths so that you have no excess line, but don't have sharp bends in any line either--they will eventually kink! Hope this helps!

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