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Old 08-11-15, 10:06 AM   #1
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Default 306 Diesel wonīt dun if you dont use priming bulb

Hi
A friend of mine are having problem with his Peugeot 306 diesel with a Lucas fuel injector pump.
He hawe schanged som of the gaskets in the fuel injector pump but now it will not run if you donīt squeese on the priming bulb all the time.
To me it seems like the fuelpump is not working, but the we canīt find the pump. Most likely it is something wrong with the injector pump.
Does the injectror pump have som sucking mekanism that is not working property or what?

Martin
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Old 08-11-15, 11:07 AM   #2
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There is no separate fuel pump these pumps have the lift pump built in most likely you have an air leak into the system somewhere.

Lucas cav pumps do not work well with any air being drawn in as the lift pump is quite weak on them.
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Old 08-11-15, 11:31 AM   #3
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Do you know witch part on this picture is the lowpressure pump that feeds from the fuel tank.

eastment.net/forum/LucasDPCcutaway.jpg
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Old 08-11-15, 12:12 PM   #4
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Quote:
Originally Posted by mliljedl View Post
Do you know witch part on this picture is the lowpressure pump that feeds from the fuel tank.

eastment.net/forum/LucasDPCcutaway.jpg

re read the post from Reliable
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Old 08-11-15, 01:18 PM   #5
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I have readed the post and he say that the lucas have a liftpump built in and since the pump have been opened I wonder that it have been som sort of wrong assembly or dameged gaskets or something so I just want to know what part in the pump get the fuel sucked in.
The engine works fine when idling and full trottle if we pump on the priming bulb.
Or may the leak been outside of the injektorpump? Even if nothing have been done with the fuellines? We see nothing visually when pumping on the bulb, but the pressure is getting somewher, if we let it sit for som minutes the bulb is soft and pressure is gone.
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Old 08-11-15, 02:12 PM   #6
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Bulb going soft is normal
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Old 08-11-15, 05:12 PM   #7
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But the problem is that if we donīt pump on that priming bulb all the time, the engine stops.
That is why I want to lokate the lift pump inside the injector pump that suck the fuel from the tank.
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Old 08-11-15, 05:26 PM   #8
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I would go back through the jobs you carried out on the pump,sounds as if you have messed up? miss placed gasket? incorrectly assembled?
Why was it taken apart in the first place? dismantling these pumps is best left to a diesel specialist with the correct testing equipment.
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Old 08-11-15, 05:36 PM   #9
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The pump was leaking fuel that is why it was taken apart and that gasket was replaced. But unfortunately the dealer have not got the whole gasket series in stock so we only changed the gasket that we know was bad.

Leaving it to a specialist was not an option beqause that would probably cost more than the car is worth.
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Old 08-11-15, 05:42 PM   #10
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Quote:
Originally Posted by mliljedl View Post
The pump was leaking fuel that is why it was taken apart and that gasket was replaced. But unfortunately the dealer have not got the whole gasket series in stock so we only changed the gasket that we know was bad.

Leaving it to a specialist was not an option beqause that would probably cost more than the car is worth.
My guess is that you have not assembled it correctly and the pump is drawing in Air instead of derv which is why it works whilst pumping the bulb

without trying to start the car pump the bulb and see if diesel is leaking through one of the gaskets

A tip here is to get hold of some talcum powder and spread it to ensure the surfaces are oil free to ensure you will see any leak
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