Try to check the delivery valve area. Meron copper washer doon sa loob that seals the fittings. Usual culprit yan part na yan, it starts with only moisture then eventually becomes drops.
Thanks for all that replied. I just want to close this to update what happened.
Couldn't find the leak last weekend so I brought it to Rapide pasong tamo.. they told me na kailangan daw iwanan ko yung car para ma-observe nila kapag lumamig na yung makina, hindi raw kasi makikita dahil uminit na. I asked hindi ba makikita yung tulo or any trace ng leak sa ilalim. sabi nila hindi raw kaya kailangan i-iwan ko... I still needed the car so hindi ko iniwanan.
I went out of their shop and i remember malapit nga pala yung kila Doc Diesel na shop. I drove to Bentan Diesel and have the tech looked at it.. in a matter of mins. he identified the problem as the Governor gasket. bumubula raw kasi doon sa may ibabaw ng injection pump. I asked him kung magkano? at kailangan bang bumili ng repair kit ($$).. Thank God, meron daw silang mga spare... I only paid for the labor and confirmed it yesterday and today na wala na ngang leak... ..
Husay! Thanks a lot guys for your replies, most especially to Dave and Jun of Bentan Diesel.