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CAT DP35K - Stops - hard to start

Number of messages: 10

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Prentice
Ontario, Canada

Hello, Looking for some help. I have started a question the same as this about 6 months ago and the problem has come back.
The unit will run fine ........but will shut off with no warning........the driver will pump the heck out the primer pump until button is hard...........the unit will then start............I have changed filters, cleaned out fuel tank, bled system, re and re primer assembly. So here is my question.....has anybody had a problem with the electric solenoid shut off on the bottom of the pump or bad wiring???????

Thanks

Posted 1 Apr 2009 01:46 AM

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AndyPandy
Staffordshire, WM, United Kingdom

Try changing the filter head / primer assembly.

Posted 1 Apr 2009 04:52 AM

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FLTdotCOdotUK
Tyne & Wear, United Kingdom

Yeh, quite a bit of trouble with the plunger, coil gets weak as it gets hot, there not that expensive so it would be the best place to start. Love faults like this, ones that jump back into life as soon as the truck see's an engineer pull up on site!

You don't say if all the lights stay on at the dash board when the truck chucks it? Assuming they all go out maybe a dodgy fuseable link?

Assuming they stay on maybe a blocked fuel filler cap not allowing tank to vent and causing a vacuum in the tank?

The small 90 degree inlet pipe into the primer head gets blocked quite easily, take the filter off and blow through the pipe into the head.

I assume it's the same spec as the UK and has a DPA pump on it? I had a sneaky little one once, years ago whereby the return from the pump was collapsed internally and was causing an in-balance inside the pump. The return pressure was equal to the inlet pressure and it just kept on bailing out every now and then. Never happened since but it's one of the ones you never forget as it was that weird.

Sounds like fun, no doubt it'll raise it's ugly head again in about 6 months time!!

LOL!!

Posted 1 Apr 2009 05:32 AM

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justinm
New York, United States

ive had trucks with the wrong tank cap all together (not vented)
i had a guy call me in
he replaced the injectors, pump, lift pump
i walk up to it he cranks it, nothing
i open the tank and i hear a very loud "WOOSH" i go ok try it now
started up lol
new cap, never had another issue

run the return to the tank into a bucket
make sure you have fuel returning to the tank

other than that
ive had all sorts of issues with those filter bases but not shut downs
usually its issues getting it primed after changing the filter (i prime them dry, pouring "clean" (unfiltered) fuel into it can bypass the filter medium and it really doesnt take much more effort to prime them dry)

-------------------------
New York, New York its a heluva town ..you know that The Bronx is up ..and im Brooklyn down

Posted 1 Apr 2009 11:14 AM

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mrfixit
New York, United States

I also had one (Yale) that the tiny hole in the filler cap gets plugged and shuts down after running a while.

Posted 1 Apr 2009 12:19 AM

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edward_t
North Carolina, United States

also ANY crack in the hoses on suction side of the fuel pump may allow just enough air in so that the unit stalls, if you can bend the fuel line and it has ANY cracks, replace that section of suction hose. air is so much finer than diesel fuel that the leak is almost never visably wet, and causes stalling only when running hard, almost never at idle.

Posted 1 Apr 2009 08:18 PM

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catlover
Victoria, Australia

Prentice
On this model there is a filter under the banjo bolt on the injection pump which is not shown on the workshop manual, it is a cleanable screen. Look where the supply pipe goes into the injector pump, I discovered this recently when I had a fuel starvation problem on the same model. Hope this helps.

Posted 19 Apr 2009 09:51 PM

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Prentice
Ontario, Canada

Great information, Thanks catlover. I will check it out.

Posted 20 Apr 2009 10:30 PM

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ian_h
West Yorkshire, United Kingdom

If its same as Mitsi setup, also check fuel tap under air filter.
Ive had these part block up and cause similar fault.
You can remove and strip down easily (5 mins) so its worth checking anyway.

Posted 21 Apr 2009 05:35 AM

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Prentice
Ontario, Canada

Well we changed the fuel filter and primer pump.
Re and Re Main in line fuse from Battery.
Disconnected fuel lines from tank and visually inspected and cleaned.
Primed and bled system.
Seems to have done the trick............for now..lol
It has been running for 2 weeks now with no complaints.
Thanks for the great advise

Posted 24 Apr 2009 10:41 PM

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