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Old 23-10-2009, 02:13 PM   #1
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Default t25 1.9tdi (anf) fuel pump problems

hello i have fitted the 1.9tdi engine in my van after blowing up my aaz engine i am running the aaz fuel pump and i have avd the pump timing and adjust the up the fuel up on the back of the pump and fitted a boost pin in it but it does putting out the power i hvae heard that some people fit a discovery fuel pump on do you think this would help or does any one else have any over ideals which may help
many thanks rob
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Old 23-10-2009, 08:23 PM   #2
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That doesnt totally make sense what you have done there.

you blew your first engine and fitted a new one with a AAZ fuel pump off your old engine.

I presume you took the cover off (well bolt thing) off the back of the fuel pump between the injector pipes and used a DTI gauge to set the timing up?

if the timing has been setup to spot on, are you saying it does run different and not as powerful?

I dont know what you have heard about 'discovery' fuel pumps which I think are all CAV pumps, but the stock vw bosch pumps good for about 200bhp with a little adjustment so I'd stick with the bosch pump. With the boost pin, usually you use one out of a 1.6TD golf engine, is that what you have done?

If you have done that before setting up the pump, I'd be inclined to set up from scratch with orignal pin and see how it drives, as changing too many variables at once makes it a pain to trouble shoot.
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Old 23-10-2009, 10:14 PM   #3
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i have not set the pump up with a dti i just use the pin in the pully do you know where i can find out about doing this too
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Old 23-10-2009, 11:27 PM   #4
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if you get a haynes manual for a golf diesel (the one I used was a mk1) it shows how to set up the pump timing. My mk3 golf haynes also goes through the proceedure.

basically you have slotted holes that hold the pump to the mount, using a locking pin through the front wheel it says to set the pump so the bolts are roughly in the middle of the slotted holes to get you started. in the back of the pump in the centre of the injector pipes theres a small bolt you take out and screw in an adaptor/dti gauge.

I bought a DTi gauge and magnetic stand off ebay for about 20 quid and its more difficult to setup to get a reading to see how far you are out but its a start.

You really do need to have a look at the haynes to understand how it works, but its really fine adjustment and it makes a massive difference.
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Old 24-10-2009, 08:43 AM   #5
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thanks bud i will try this
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Old 24-10-2009, 12:52 PM   #6
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Get yourself over to brick-yard
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Old 24-10-2009, 02:03 PM   #7
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ok bud i will take a look
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Old 24-10-2009, 11:21 PM   #8
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Just for clarification, do you mean AFN engine code or ANF? ANF is 5 cylinder 2.5TDI, AFN is 1.9TDI. I suspect you mean the latter. Personally I don't see how anyone can expect a TDI to run sensibly with an old mechanical fuel pump from an AAZ.
It's like asking an Olympic athlete to perform on a diet of just custard creams. Totally inappropriate.
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Old 24-10-2009, 11:41 PM   #9
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Quote:
Originally Posted by Rad Dubs and Englishmen View Post
It's like asking an Olympic athlete to perform on a diet of just custard creams.
Quote for the win!
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