Hi all im hoping someone can save my doblo van from the scrap man as its stranded in portugal and been with a mechanic for five weeks,
five weeks ago I put fuel in and drove it to where we was staying, I turned it off and half hour later went to it but lights came on dash but would turn over and radio wouldnt work, it would bump start though, I pulled out the ig 50amp relay under the bonnet next to the battery cleaned it and pushed it back in but since then the fuel will not come through, mechanic put on a new earth which makes it turn over but wont fire as fuel not coming through, computer says no faults, relay has power , no air in pipes,cant seem to find a manual pump or button for fuel activation.somebody has said when I pulled the relay it cuts off the send fuel signaal but mechanic says its all been reset.
does anyone have any ideas about this as ive only had it a few months and seems its now going to have tobe scrapped, ìts a 2001 doblo diesel van non*turbo.

gary2312 said:

Hi all im hoping someone can save my doblo van from the scrap man as its stranded in portugal and been with a mechanic for five weeks,
five weeks ago I put fuel in and drove it to where we was staying, I turned it off and half hour later went to it but lights came on dash but would turn over and radio wouldnt work, it would bump start though, I pulled out the ig 50amp relay under the bonnet next to the battery cleaned it and pushed it back in but since then the fuel will not come through, mechanic put on a new earth which makes it turn over

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That sounds familiar... you probably burned up some ground wires inside the engine harness by trying to crank it with a bad main ground wire. Finding out which ones is going to be a very tedious task and will involve taking off the whole engine wiring harness (usually in two parts, both starting at the ECU), ringing out the individual wires (service manual will have a diagram) and replacing the ones that are affected.

but wont fire as fuel not coming through, computer says no faults, relay has power , no air in pipes,cant seem to find a manual pump or button for fuel activation.somebody has said when I pulled the relay it cuts off the send fuel signaal but mechanic says its all been reset.
does anyone have any ideas about this as ive only had it a few months and seems its now going to have tobe scrapped, ìts a 2001 doblo diesel van non*turbo.

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Does the LP fuel pump in the tank even start to work when you turn the key?
IIRC this is a classic mechanical injection engine w/ mechanical throttle; the only other place where it actually needs electricity to run is the shutoff valve at the injection pump. Does it become energized at all?

agreed,
I would ( if necessary) run a basic switched 12 v supply to the tanks lift pump.. just to see if it'll start..

Here´s the relevant section of the service manual:

https://manuals.co/workshop/fiat/doblo/fiat-doblo-workshop-manual/2980722/127

Seems like it has an electronically controlled injection pump (Lucas EPIC) where the throttle wire does not directly control the pump any more. So you´ll need a working, unlocked, correctly wired ECU(DCU) to run it
The LP pump is in the fuel filter - is there power getting to it at all?
What´s the status of the immobiliser? If it has lost its coding it will allow the car to be cranked, but there will be no fuel injection. Has the mechanic tried to re-learn the key?

niggles said:

The LP pump is in the fuel filter

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Scrap that, had another look into the manual and it shows that the EPIC has no external boost pump. So either one of the wires going to the Pump unit has been shorted to ground or a different circuit by a melting ground wire nearby; that´ll be relatively easy to check for with a multimeter.
Or the overcurrent going through some of the ground wires has played havoc with one of the control units. FIAT uses a "body computer" that checks for presence of the coded RFID chip in the key on startup, verifies it is authorised to start the car (challenge/response) and then unlocks the ECU via CANBus. Without this authorisation the ECU will not actuate the coils in the EPIC that admit fuel to the engine.
The ECU also checks some other sensors (minimum engine rotation speed, pump actuator position) before it even opens the stop solenoid.
Does your mechanic have access to a diagnostic computer that can check these conditions?

Looks like 2018 might bring mews