[Vwdiesel] leaking injection pump

[Dave]

Hi,

 I have been writing you off and on about getting my diesel running for my 16 year old. It has been on the road for about 3 weeks and it runs great, the only problem has been sometimes the idle would race when you came up to a stop. I had noticed occasionally a little puddle of fuel under the car and couldn't see where it was coming from, but I have to admit I wasn't getting the mileage that I should be getting. My son parked the car at a public parking or commuter lot and left it over night. I came to pick him up tonight and there was a large puddle under the car. I had him start it up and watched with a flash light and I could see fuel dripping from under the pump. The car starts good, runs great, but it's dripping fuel. I  am certain it's not the injectors or the fuel lines. So I am looking at replacing the pump. I have two old one's I have lying in my garage that I have had for about 10 years that come from running cars. My mechanic told me that they
 would be just a waste of time using them because the seals would be shot them setting that long. What do you guys think? If I end up replacing the pump could you guys recomend a good shop I could order one from. I saw on the internet a place vwdiesel.com. They offer a pump $370 with $150 of that being core, but I know cheap is not always better.  

Thanks

Dave