whats the purpose of an additional frame mounted fuel pump

[94 lngbd]

I got all of the fuel tank components from a 90 Bronco II including an additional frame mounted factory fuel pump. Whats its purpose when there's one already in the fuel tank?

 

[LearjetMinako]

The gas tank's fuel pump is low pressure. The fuel pump mounted to the frame rail is high pressure.

It is Ford's idea of a conversion from a carb'd engine to fuel injection. You only need around 2-8 psi to get the fuel from the tank to the engine with a carb'd engine. But with fuel injection, you need around 40 PSI for the injectors to spray a mist of fuel into the engine.

 

[AllanD]

I got all of the fuel tank components from a 90 Bronco II including an additional frame mounted factory fuel pump. Whats its purpose when there's one already in the fuel tank?

a 1990 or even a 1989 Bronco2 will not have a frame mounted fuel pump, the last year for a frame monted pump is 1988.

Ford switched to a high pressure in-tank pump for the 1989 model year.

AD

 

[Valhalla94]

i know in my 86 ranger i have 2 frame mounted fuel pumps and 2 fuel filters......

 

[94 lngbd]

interesting as the under hood emissions info & the ID tag on the Door area all stated that it was a 1990 & the guy even had the title to prove it as he was complete disassembling the vehicle to haul away for scrap & was keeping the 4wd running gear

 

[94 lngbd]

The gas tank's fuel pump is low pressure. The fuel pump mounted to the frame rail is high pressure.

It is Ford's idea of a conversion from a carb'd engine to fuel injection. You only need around 2-8 psi to get the fuel from the tank to the engine with a carb'd engine. But with fuel injection, you need around 40 PSI for the injectors to spray a mist of fuel into the engine.

thanks that the info I needed

 

[94 lngbd]

a 1990 or even a 1989 Bronco2 will not have a frame mounted fuel pump, the last year for a frame monted pump is 1988.

Ford switched to a high pressure in-tank pump for the 1989 model year.

AD

so maybe it wasn't a real 1990, will I be able to get a pump for a 89 or 90 & will it fit it into the same hole as the low pressure pump that's in the tank

 

[94 lngbd]

will the 89 + fuel pump mount into the 19?? 23 gal Bronco II to eliminate the use of 2 pumps? Or I ques I could use that extra pump for emergency fuel transfer to other vehicles,some cop cars are hooked up that way.