1983 John Deere 510D Backhoe

Troy Panetta · Apr 26, 2020

Delmer said:
Troy, did you follow the lines from #1 and #3 back to see where they go? The injection pump takes the fuel in the end and returns it on the other fitting, like THEpumpguy said, but that doesn't mean somebody didn't change them around, obviously this has been messed with recently, and possibly never got to work right, which might be why it was for sale. Obvious clues: non stock filter, pump, hourmeter with 10? hours, rebuilt/different injection pump with different mounting bolt hole drilled (pumpguy?)

What's the quick coupler with the hose clamps right in the middle of the pic? I hope that's for "spit swapping" the coolant to start it in winter time.

After tracing the lines, how about an explanation, or better yet, pictures of the hose routing from the fuel tank to the injection pump and back again, there could easily be several issues with this one.

so the routing is from the tank to the first filter, through the fuel pump around the motor to the glass filter and then back around the motor to the stanadyne pump. the return side goes to all the injectors and then to the fuel tank.
Hour meter reads 8010 hours and i think its accurate as it still runs.
The quick connect hose runs to the heater inside of the cab from the radiator

Delmer · Apr 26, 2020

Even better, unhook #1 from the injection pump and turn the key to let that pump run to see how the fuel flows through the whole system.

By the way, when tracing the fuel lines, there may be a large hex nut on the fuel tank inlet or just a small fitting down low on the tank, the return should be a smaller line that tees with the return from injectors and goes to the top of the tank. There should be a glass rectangular fuel filter, take that off and shake it and drain the gunk and water out. Is the stock mechanical lift pump/primer pump still in the system? Does it pump by hand? I'd get rid of the electrical pump and small filter if possible, but maybe finish the diagnosis before that.

I see on jdparts, that the one bolt in the injection pump flange is correct, wasn't familiar with that one.

Troy Panetta · Apr 26, 2020

thepumpguysc said:
How about taking the line off at the electric fuel pump & while holding it over a bucket, turn the key on & WATCH the flow for a couple of minutes.. try to SEE if the flow slows down any.. {2-3minutes}
Ya never know, maybe the electric pump gets hot & shuts down, restricting the flow to the inj. pump.??
Another thing too.. they dont like 5 gallons at a time in the fuel tank.. IF thats how your running it.. your causing your own problems.. IMO

which side should i disconnect, I assume you mean after the pump to see if the pump is slowing down when it works due to heat or whatnot

Troy Panetta · Apr 26, 2020

Delmer said:
Even better, unhook #1 from the injection pump and turn the key to let that pump run to see how the fuel flows through the whole system.

By the way, when tracing the fuel lines, there may be a large hex nut on the fuel tank inlet or just a small fitting down low on the tank, the return should be a smaller line that tees with the return from injectors and goes to the top of the tank. There should be a glass rectangular fuel filter, take that off and shake it and drain the gunk and water out. Is the stock mechanical lift pump/primer pump still in the system? Does it pump by hand? I'd get rid of the electrical pump and small filter if possible, but maybe finish the diagnosis before that.

I see on jdparts, that the one bolt in the injection pump flange is correct, wasn't familiar with that one.

the lines are exactly as you describe. The rectangular glass filter looks clear as could be, no sediment or water in it at all. the manual pump doesnt seem to be here anymore looks like it was replaced with the electric one

Delmer · Apr 26, 2020

I would disconnect #1 at the injection pump, then you see what the injection pump sees. You may need to operate until the engine slows down if this is an intermittent problem. Could be trash anywhere in the system, or the pump getting hot/worn...

Is the stock mechanical lift pump/primer pump still in the system? Does it pump by hand? RATHER, can you see where it was? should be a small hole with two bolts or threaded holes on the camshaft area (the injection pump is driven off the camshaft to give you an idea of where the cam is, parallel to the crankshaft low on the engine)

Also, did you drain any fuel from the petcok in the bottom of the tank?

as far as I know, loosening the timing window and not changing anything means you're dealing with fuel supply, not the plugged return fitting.

Troy Panetta · Apr 26, 2020

Delmer said:
I would disconnect #1 at the injection pump, then you see what the injection pump sees. You may need to operate until the engine slows down if this is an intermittent problem. Could be trash anywhere in the system, or the pump getting hot/worn...

Is the stock mechanical lift pump/primer pump still in the system? Does it pump by hand? RATHER, can you see where it was? should be a small hole with two bolts or threaded holes on the camshaft area (the injection pump is driven off the camshaft to give you an idea of where the cam is, parallel to the crankshaft low on the engine)

Also, did you drain any fuel from the petcok in the bottom of the tank?

as far as I know, loosening the timing window and not changing anything means you're dealing with fuel supply, not the plugged return fitting.

So I did not drain any fuel from the tank. I do not see the mechanical lift pump and will take some pics to post and show you

thepumpguysc · Apr 26, 2020

I'm w/ u Delmer.. fuel "supply" problem.

Troy Panetta · Apr 26, 2020

Troy Panetta said:
So I did not drain any fuel from the tank. I do not see the mechanical lift pump and will take some pics to post and show you

thepumpguysc · Apr 26, 2020

Am I missing something here..?? Theres only 1 line going to or from the stanadyne glass filter..
Does that mean its by-passed.?? & they're only using that small filter by the electric pump.??

Troy Panetta · Apr 26, 2020

OK guys I removed the fuel pump and put the ignition on for a couple minutes. Fuel is barely coming out of this. here is a picture i hope it helps. But i would describe the flow out of the fuel pump as dripping with a very slight spit

Troy Panetta · Apr 26, 2020

thepumpguysc said:
Am I missing something here..?? Theres only 1 line going to or from the stanadyne glass filter..
Does that mean its by-passed.?? & they're only using that small filter by the electric pump.??

the other line is not in view it comes in on the bottom right in the back. it is inline and working

thepumpguysc · Apr 26, 2020

Well.. u found the problem.. SUPPLY.. U might have something clogging the electric pump.??
Take both lines off & get an air compressor to blow thru the electric pump.. Your mouth aint gonna cut it..
Next, take the cap off the tank & blow back from the electric pump w/ shop air.. SLOWLY..
U HAVE TO HAVE a "stream" of fuel.. its not gonna be hi pressure but u NEED a stream..
Like I said, the fuel spec on the pressure is 1-3psi.. low pressure but hi volume. {stream}
Good luck.. When u find the clog, you'll know it when the dribble turns to a stream..
OR the electric is bad..
Just for kicks, take off the FEED LINE from the electric & see how THAT flows.. IF its higher, your restriction IS the electric pump..
U DID have the key ON when u checked the flow didnt u.??

Troy Panetta · Apr 26, 2020

thepumpguysc said:
Well.. u found the problem.. SUPPLY.. U might have something clogging the electric pump.??
Take both lines off & get an air compressor to blow thru the electric pump.. Your mouth aint gonna cut it..
Next, take the cap off the tank & blow back from the electric pump w/ shop air.. SLOWLY..
U HAVE TO HAVE a "stream" of fuel.. its not gonna be hi pressure but u NEED a stream..
Like I said, the fuel spec on the pressure is 1-3psi.. low pressure but hi volume. {stream}
Good luck.. When u find the clog, you'll know it when the dribble turns to a stream..
OR the electric is bad..
Just for kicks, take off the FEED LINE from the electric & see how THAT flows.. IF its higher, your restriction IS the electric pump..
U DID have the key ON when u checked the flow didnt u.??

LOL, I did have the key on. I will pull the pump now and blow it out as well as the line to the tank. I will let you know the results. Thank you so much

doublewide · Apr 26, 2020

If the stock glass filter is working, why the extra filter? They must be adding some restriction to flow.

doublewide · Apr 26, 2020

I see, you have an electric boost pump.

Andy1845c · Apr 26, 2020

I just had a similar issue with my 710. Was pretty sure I had just put a fuel filter on not too long ago, and the problem was intermittent - so how could it be the filter anyway?? It was the filter. Don't be like me. Completely 100% rule out the easy and obvious before you start tearing it apart.

Delmer · Apr 26, 2020

In this case, the glass filter base allows you to drain water, and probably bleed the air out the top also, so you can open those to confirm you have the same flow before and after the filter element, that is out of the bottom and the top of the glass bowl base, through the aluminum plugs. they're often loose enough to open by hand, seal with o ring.

1983 John Deere 510D Backhoe

Troy Panetta

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Delmer

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Troy Panetta

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Troy Panetta

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Troy Panetta

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