Hi all not been on here in a while dont own a Ford anymore, long story but this car ive got now with the engine in the title, its done 175,000 miles and theres a rattle coming from the right hand side of the engine near the cam cover, seems to be coming from this metal box bolted to the side of the head which i now know is the tandem pump. I believe this is for the fuel pump and something vac related to do with the brakes?

Now it drives fine, its a bit flat below 2500 revs, when its cold and you start it it sounds really clattery for the first 10 - 15 seconds but if you rev it it clears

The brakes are brilliant on it either, pads and that all look new its been well looked after, but im constantly feeling the ABS kicking in where the pedal goes hard and rumbles under your foot?

Just wondering if these problems are linked to the rattling tandem pump, and even if tandem pumps do rattle, what causes the rattle? and finally are they easy to change?

Thanks