High Pressure Fuel Pump?

[ABSOLOOT LOONASEA]

I am curious as to why some Rangers have a fuel pump in the tank and a high pressure fuel pump farther down the line. I have a 90 2.3 and NO high pressure pump, just the one in the tank. Any thoughts?

 

[Dirtman]

It was a relic of carbed days. The in tank pump provided enough pressure for a carb but not enough for fuel injection. So when they first started adding fuel injection they just left the original low pressure pump and sender assembly in the tank to feed fuel out of the tank, and then added the high pressure pump on the frame rail to up the pressure. It was just more cost effective then designing a whole tank, pump and sender assembly.

They later did redesign the whole thing and just put the high pressure pump in the tank so no more need for a second pump on the frame. So your truck DOES have a high pressure pump, it DOESN'T have a low pressure pump...

 

[ABSOLOOT LOONASEA]

It was a relic of carbed days. The in tank pump provided enough pressure for a carb but not enough for fuel injection. So when they first started adding fuel injection they just left the original low pressure pump and sender assembly in the tank to feed fuel out of the tank, and then added the high pressure pump on the frame rail to up the pressure. It was just more cost effective then designing a whole tank, pump and sender assembly.

They later did redesign the whole thing and just put the high pressure pump in the tank so no more need for a second pump on the frame. So your truck DOES have a high pressure pump, it DOESN'T have a low pressure pump...

Thanx Dirtman, I was just curious.

 

[RonD]

While Dirtman's post was a thoughtful and reasoned response, that fits the facts, its not complete.............

In the 1970's and 1980's there was a Cabal of low pressure fuel pump manufactures bent on World domination
The shift to fuel injection caught them by surprise, "Who would buy a car that didn't have a carburetor????"
They had "inside men" at all the car makers that keep designing vehicles with low pressure pumps
But new engineers were pushing for fuel injection so they had to work around the "inside man" and add a high pressure pump
Eventually the higher ups at these car plants said "WTF, why TWO fuel pumps, are you insane!!!"
So the "jig was up"
World domination defeated by a simple lack of seeing the future correctly
Happens all the time

 

[Dirtman]

While Dirtman's post was a thoughtful and reasoned response, that fits the facts, its not complete.............

In the 1970's and 1980's there was a Cabal of low pressure fuel pump manufactures bent on World domination
The shift to fuel injection caught them by surprise, "Who would buy a car that didn't have a carburetor????"
They had "inside men" at all the car makers that keep designing vehicles with low pressure pumps
But new engineers were pushing for fuel injection so they had to work around the "inside man" and add and high pressure pump
Eventually the higher ups at these car plants said "WTF, why TWO fuel pumps, are you insane!!!"
So the "jig was up"
World domination defeated by a simple lack of seeing the future correctly
Happens all the time

Freaking Qanon!

 

[RonD]

YUP
Flat earth, lizard people, tunnels under Denver airport, it all fits