Annoying top end noise

DiscoT · Aug 26, 2014

My 300tdi has developed a really annoying knock/tap from the top end. It's seems to be from the fuel pump area. There doesn't seem to be any difference in performance and only does it on idle. I've cracked the injectors off and it does make a slight difference. When I did this there didn't seem to be the same amount of fuel coming out of the second injector. I'm pretty certain it's either injectors or fuel pump timing but can't find the thread on how to retime it. Any suggestions? Cheers

tetsu0san · Aug 27, 2014

If your lift pump is failing then the injector pump has to do more work to suck fuel through and it won't be as lubricated from excess fuel. This can cause the injector pump to tap.

How many miles has your engine done and have you ever changed the lift pump?

KevAmiga · Aug 28, 2014

Change the fuel filter if it hasn't been done in ages.

DiscoT · Aug 28, 2014

Is there any way of checking the lift pump? I've taken the top off and cleaned the crap out. Not sure how old it is though as it was on the car when I bought it. I've put a new fuel filter on it. Think I'll change the lift pump see if it improves at all.

KevAmiga · Aug 28, 2014

Lift pumps are cheap enough. I changed mine in 5 mins last week. Hardest bit is keeping the gasket in place

DiscoT · Aug 28, 2014

Sorted, I'll get one ordered.

Dippypud · Aug 28, 2014

Also clean the crap from the sedimentor, if you still have one ... (off-side rear wheel arch, inboard of chassis) ...
Make sure you have a carrier bag ... nasty thing live in 'em ... erghh

http://www.landyzone.co.uk/lz/f8/cleaning-out-sedimentor-137301.html

DiscoT · Aug 29, 2014

Thanks for that. I had a half arsed go at getting it off the other night but gave up. The 11mm bolt on the top didn't seem to want to undo

Annoying top end noise

DiscoT

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tetsu0san

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KevAmiga

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DiscoT

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KevAmiga

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DiscoT

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Dippypud

Never Knowingly Understood

DiscoT

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