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TD42 GQ
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An electric vacuum pump is probably the easiest replacement for the alternator pump.
Reliability? Well a good quality electric pump should be reliable enough and will still work when the engine isn't running.
The downside? It's yet another thing we have to find a place for in an increasingly crowded engine bay.
Is it legal to replace the factory alternator pump with an electric one? Insurance etc?
IF I wanted a larger alternator then personally I'd go for an electric vacuum pump and I'd also wish for a hydroboost set-up for the brakes.
 
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