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no diesel pressure; no diesel pressure
Topic Started: Jul 11 2011, 02:03 PM (3,463 Views)
morne
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Hi all

I have a 50C13 that I had the head off and after reassembly I don’t get any diesel from the high pressure pump to the rail.
There is a new elec. pump fitted, a new pressure control valve and new filter.
When the electric pump is running I can hear the diesel circulating and even after the pump switched off, is that normal?
I am not a mechanic and need some help please.

regards
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Bazil-S
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Hi,

No, it is not normal to circulate the fuel after the pump is stopped.
Perhaps you have inverted fuel lines, the entry with the exit of the fuel filter, or of the tank.
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morne
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Hi Bazil

The pipes are like they were, I hope, and like I can make out on the manual.

I only get 9.46 V at the solenoid valve on the high pressure pump, should that be 12V?

Regards
Morné
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Bazil-S
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Hi,

Solenoid on the high pressure pump is powered by EDC with a PWM signal (pulse width modulation) is a current that is pulsating.
Do not fed directly from the battery!
If the solenoid is faulty EDC warning lamp will be lit.
Check if the Immobilizer warning lamp is lit.

On the diesel fuel filter are orientation arrows, red pipe is the entrance filter, black pipe is out of the filter and input in high-pressure pump, gray pipe is out of the high pressure pump (return).
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morne
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Hi
On mine there is a red in on the filter from the low pressure pump, a red out to the high pressure pump and a black pipe on top of the filter to the return manifold. Then there is the grey pipe from the return manifold to the tank. These all have quick release fittings. Then there is a pipe with hose clamps between the manifold and the high pressure pump and the injector return pipes to the manifold.

My problems started when the cam belt slipped some teeth and it knocked the intake valves. I took the head and it looked fine so I had it pressure and vacuum tested, all good. I replaced the dented shim buckets and shimmed the head.

Now some one told me I should have replaced the intake valves for I will certainly drop a valve very shortly. So it seems its back to taking the head off.

Is that true? Can some one please advice?

Thanks in advance.

Morné
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Bazil-S
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Hi,

The pipes are fitted well.
I do not understand why you changed the pump and the pressure regulator and about warning lamp you did not say anything.
About the intake valves, I do not know.
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morne
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Hi Bazil

There were a lot of air in the red supply pipe from the elec. pump. I took it off and tested it separately with some clear fishtank pipes. Lots of air pumped through.
Before the van broke down, and every time one got close to 3000 rpm it lost all power and throttel for about 10 sec. with the red injector light flashing. I was told that it is the
pressure reg.

Regards
Morné
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Bazil-S
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Hi,

First, you should solve the problem of air in the fuel system.
Check the quick connectors from the tank and electric pump, then check the fuel level sensor assembly, the delivery pipe can be cracked.
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morne
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Hi Bazil

It was the electric pump that sucked air into the sistem, no more air.
I will again take the head off tomorrow. It has sodium filled valves, that must be replaced.
Another thing, I did the blink code test with a led and got 19 errors. I dont know how many are old ones, how do one clear/ reset them.

Regards
Morne

Edited by morne, Jul 17 2011, 04:07 PM.
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Bazil-S
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Hi,

Codes are stored in the order they occurred. Note them on a paper, then try to delete.
Post the codes (all) and we will analyze them.
Press and hold the button, switch the ignition on, after five seconds release the button and switch the ignition off.
If the codes are not deleted, this means that the button is powered by the ignition​​, not directly from the battery.
In this case, ​​a little improvisation must be made, cut the green wire 8150 from the button connector (an inch from the connector), and connect the red wire 7721 from the cigarette lighter, to connector (instead of cut wire 8150).
But do not rush to delete the codes, or to cut wires because this is not a priority, be patient and I will do a tutorial in the future. It is important to fix the van, then clean the memory of EDC.
Remember the last defect are stored last.
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morne
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Thanks Bazil

I'll let you know when the head is back on, then it will be back to the diesel presssure.

regards
Morné
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morne
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Hi Bazil and all

It was the hp-pump, apparently the d-valves inside. I had it overhauled and she starts.
The last couple of months it turned over for about 20 sec. before it started, and that is still the same. About 5 sec. when its hot.
I did the leak test and all the injectors gives between 4.5 and 6ml per min. so they seem fine, they have been replaced about a year ago.
One must work the accelerator pedal when cold or else it will not start. any ideas.

Regards Morné
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Motormedic
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The high pressure pump does not fuel if you have no pressure,make sure your fuel filter is full and give it a sniff of easy start,I do this quite often in the workshop on many makes and models.Its stupid that the pump does not fuel without pressure but you can not get pressure when its not running ^o) ,
I use a can of start u bastard works all the time.
MM
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morne
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With quick-start it starts when I only touch the key.
I have cleared all the blink code errors (after logging them) and after starting it again there are no new errors. I suppose that is a good thing or will they only show after the van was driven.
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Motormedic
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Prob will get them after it has been running but these codes may have been put on due to pulling plugs connectors of or one fault could bring on many codes some may be sporadic. good luck off to the states in morning so hope to see you get it sorted for when I get back.
MM
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