The lift pump is what sucks the fuel from your tank and feeds the injection pump at about 8psi.

The injection pump takes that constant 8psi and basically has a plunger for every cylinder that takes your 8psi and makes it about 1200psi at the perfect time.

__________________
Jesse.
'80 300sd modded everything begging for more fuel.
'98 f-250 psd, d60 elocker front, intake, exhaust, dp tuner F5 etc..
'70 f-250
'83 242 Volvo project
'66 volvo amazon
'10 fuso FE-180 service truck, welder, compressor, 3500lb crane, oil tanks, etc...

Just how impressed is a 115 bar injector going to be with 1200 psi fuel pressure?

It was to simplify things and at that time the exact pressure escaped my mind in a puff of cerebral flatulence. I guess I should had of said about 1669.7psi. Still made sense though of the difference between the two.

__________________
Jesse.
'80 300sd modded everything begging for more fuel.
'98 f-250 psd, d60 elocker front, intake, exhaust, dp tuner F5 etc..
'70 f-250
'83 242 Volvo project
'66 volvo amazon
'10 fuso FE-180 service truck, welder, compressor, 3500lb crane, oil tanks, etc...