Powerstroke uses high pressure oil to activate the injectors.
At start-up, the high pressure pump (HPOP) draws oil from
the reservoir to start the engine, and the low pressure
pump is refilling the reservoir with unfiltered oil until
there is engine oil lube pressure. This allows a small amount
of dirty oil from the oil pan to reach the HPOP and the
injectors every time the truck is started. Small fine debris
will pass fairly easily, but larger debris can cause pump
or injector damage. In mid year 1999 (Engine Serial Number
1039779), Ford integrated a filter screen into the front
cover gasket to catch any large debris before entering the
HPOP. This new "gasket" with integrated
filter CANNOT be retrofitted into an older engine as the
front engine cover was machined differently to accommodate
it. If you do use this gasket accidentally, you will crack
the front cover causing a very expensive repair bill.
NOTE: If you go to your Ford dealer to buy a reservoir gasket
for your 1999 model year truck, they will give you the new
gasket with filter screen. Someone messed up in the application
guide. To get the right one for this model year, you must
ask for a 1997 gasket. Our adapter comes with all the gaskets
and hardware you'll need.
developed this adapter to allow the use of the new style
filter gasket in the older engines. All gaskets,
bolts, and port plugs are included.
In testing for the PULSE HPOP and building a dual PULSE
pump version, Dieselsite came across something that needed
to be addressed. Most dual pumps on the market utilize a
3/8" feed line to the rear pump. Using a stock pump,
this is simply not large enough. The rear pump actually
pumps at 60% of rated flow. That means your "200%"
dual pump is actually pumping 160% of that of stock and
the rear pump is slowing tearing itself apart. The noise
level from this is deafening when not drowned out by the
actual engine noise. I have had some say they can hear a
squeal from the pumps but were told it was "normal".
Dual stock pumps need a minimum of a 1/2" or #8 line.
Our Dual PULSE needed a 3/4" or #12 line!!!! They drilled
and tapped a #8 o-ring thread into the adapter for this
purpose. Yes, you are reading this correctly. If you install
this adapter, and run the larger feed line, your pumps will
put out more oil! They will pump what they were supposed
to pump. Besides, cavitation will kill a pump of any kind.
in testing this issue on your truck? There is a small #6
O-ring plug on the passenger side of the pump. Run a pressure
gauge from this port to somewhere that you can read it while
the engine is running. You MUST have at least 3-4psi oil
pressure. If you do not have oil pressure here, the rear
pump is starving for oil. HPOP's do not suck oil. They must
be fed oil under pressure. The factory oil pressure gauge
reads "normal" if you have at least 6psi in the
reservoir. This guarantees that you have enough oil to feed
the HPOP. However, pressure in the reservoir DOES
NOT mean you have pressure in the inlet of the
back pump. There are tremendous losses in volume and pressure
due to friction of the side walls of the feed line to the