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Hi there every one this is my first post so please bear with me...I have a 1998 6n 1.4 petrol polo which has been playing me up slightly the problem is fuel I have to put a bit of fuel in the throttle body for it to start then it will start all the time well when I say all the time if I leave it for a few hours I have to put some more fuel in the throttle body and away she go's..I have changed the fuel filter but still the same..when the car is running I have unplugged each injector to see if they are working which they are..any help would be appreciated 

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At a guess I would say this could be something along the lines of a weak fuel pump, as they can deteriorate over time.

If this isn't the case, I assume you are not leaking fuel anywhere? It could be as simple as injector seals /  intake seals that are damaged?

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steveo3002

what happens if you repeatedly cycle the key..any better?

 

id think along the lines of pump or some valve that holds the pressure ...id have thought it would store a code for it too so get it scanned 

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nige8021

First Welcome to the forum.

 

Sounds like the system isn't holding pressure there is a test for this, you need to put a pressure gauge in the supply line from the tank (White connector) and the fuel rail and with the engine running it should be 3 bar, switch engine off 

Observe pressure drop on pressure gauge. After 10 minutes the pressure must not drop below: engine codes ADX, AEA, AEV: 1.2 bar: engine codes AEE, AER, AEX, AKV, ALL, ANX, APQ: 2 bar.

If the pressure drops further:

–Check line connections for leaks.

If no fault in lines is detected:

–Renew fuel delivery unit.

 

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11 hours ago, oollie2 said:

At a guess I would say this could be something along the lines of a weak fuel pump, as they can deteriorate over time.

If this isn't the case, I assume you are not leaking fuel anywhere? It could be as simple as injector seals /  intake seals that are damaged?

No fuel leaks ive checked so all good there I am leaning more to the fuel pump 

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7 hours ago, steveo3002 said:

what happens if you repeatedly cycle the key..any better?

 

id think along the lines of pump or some valve that holds the pressure ...id have thought it would store a code for it too so get it scanned 

I have tried that and nothing it don't even try to start...next step is to get it to the garage and put on the fault machine...

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6 hours ago, nige8021 said:

First Welcome to the forum.

 

Sounds like the system isn't holding pressure there is a test for this, you need to put a pressure gauge in the supply line from the tank (White connector) and the fuel rail and with the engine running it should be 3 bar, switch engine off 

Observe pressure drop on pressure gauge. After 10 minutes the pressure must not drop below: engine codes ADX, AEA, AEV: 1.2 bar: engine codes AEE, AER, AEX, AKV, ALL, ANX, APQ: 2 bar.

If the pressure drops further:

–Check line connections for leaks.

If no fault in lines is detected:

–Renew fuel delivery unit.

 

Regarding the fuel pressure when I got in from work (I don't use my car for work) I took the feed fuel line of the injector rail and there was no pressure at all there so I put it back on and turned the car over obviously it didn't start but checked the same fuel line and it had pressurised up...hope that makes sense 

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nige8021

Yeah, that indicates the fuel pump non return valve is leaking, hence you have no initial pressure at the injectors, so that means a new pump unit 🙁

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Cost wise, I would definitely try changing the intake seals just to make sure there’s no pressure loss there. 
However I definitely agree with all the above, really sounds like it’s full pump / non return valve related unfortunately.

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7 hours ago, nige8021 said:

Yeah, that indicates the fuel pump non return valve is leaking, hence you have no initial pressure at the injectors, so that means a new pump unit 🙁

 

7 hours ago, oollie2 said:

Cost wise, I would definitely try changing the intake seals just to make sure there’s no pressure loss there. 
However I definitely agree with all the above, really sounds like it’s full pump / non return valve related unfortunately.

Thanks for everybodys help i will source a fuel pump and get it fitted...

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11 hours ago, oollie2 said:

Cost wise, I would definitely try changing the intake seals just to make sure there’s no pressure loss there. 
However I definitely agree with all the above, really sounds like it’s full pump / non return valve related unfortunately.

Thanks for all the help.. regarding the fuel pump is the none return valve built into the pump or is it a separate part... 

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nige8021

The valve is part of the pump/delivery unit and isn't a separate/replaceable item

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2 hours ago, nige8021 said:

The valve is part of the pump/delivery unit and isn't a separate/replaceable item

Thanks I wasn't to sure..

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I am after a bit more help/advice if you all don't mind. I am looking for a fuel pump for my polo..bear with me here...the code on the one in my car is..6 NO 919-051-L...228-231-003-001 which when I look on ebay says it is for a 1.0 polo...when I look at the one for a 1.4 which my car is it's code is 6NO-919-051-N..the fuel pump in my car looks original but it could have been changed sometime..the only difference I can see are the letters at the end would this make a difference...thanks 

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nige8021

Have a look at these links as the part number depends on the chassis numbers https://volkswagen.7zap.com/en/rdw/polo+derby+vento-ind/po/1998-158/9/919-919050/  &  https://volkswagen.7zap.com/en/rdw/polo+derby+vento-ind/po/1998-158/9/919-919051/  as you have the 1.4mpi you will need the 3.0bar pump unit 

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