Squeezing more power out of an already maxed out 11mm bosch pump

[Dave]

Delivery valves are a must, I used to use the Transit delivery valves gives heaps more fuel, you can actually grind the stock ones down too, just have a few spare incase you f*ck it.

How do you go about grinding the standard delivery valves just out of intrest?

I'll bet a fiver it was with a 9 inch grinder knowing Dave

Hehe Tom you do have more of a systematic approach to pump mods. The DVs on my first pump did make a huge difference to fuel delivery. As long as you don't kill the seat there is only gains to be had if you see how restrictive the origice is on original ones round stock DVs