Major fuel pump problems, air leak, head gasket?

[Dantheman1312]

Bosch ve fuel pump
Peugeot 306
Pump has been played around with (max fuel screw and the top screw on the mushroom bit)
Running on veg oil

Cold starting problems
Hot starting problems
Lots of black smoke when foot is down
No power
When I start my car it misfires with a ploom of white OR black smoke although it is more often than not white.

When running and up to temp it still misfires.

I have a boost guage fitted and it reads 22psi with 50% throttle (this is unusual as It used to be about 18psi)

I believe the pump is leaking air into the fuel beacuse it bunnyhops down the road at low revs.

all the connections on the fuel system I have made are tight and good with no air in the fuel.

Thanks Dan

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