Two fuel pumps in 1988 STX - Ranger-Forums - The Ultimate Ford Ranger Resource

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Old 05-29-2012
Thread Starter
Join Date: Jan 2011
Location: San antonio, texas
Posts: 12
Two fuel pumps in 1988 STX

My son is working on a 1988 STX Ranger. We discovered it has two fuel pumps. The one in the tank is described in the Haynes manual for 1985-1988 models as a low pressure pump and the one bolted on the frame is called the high pressure pump.

The "typical" wiring diagram shown for the 2.9 liter does not have any reference to the two fuel pumps. Is the second "high" pressure pump wired in the same fashion as the "low" pressure pump? We finally got the low pressure pump working, but not sure if the second high pressure pump is. The truck runs and idles, but we haven't driven it yet.
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Old 08-01-2013
Join Date: Jul 2013
Location: Savannah, GA
Posts: 3
Why does no one answer these questions?

Is there a better forum where you can actually get information?
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Old 08-04-2013
Join Date: Aug 2008
Location: Taylor, Michigan
Posts: 96
Apparently no one is familar with the "two pumps."

There are other forums where there may be someone who is.
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Old 01-15-2014
Join Date: Jan 2014
Location: Monson
Posts: 2
Hey i am a new member but i think i can help u. If it came with two pumps it def needs two pumps. to quickly check if both pumps are working put a high pressure fuel gauge on the fuel rail. unplug high pressure pump and start the truck, if it runs on the low pressure pump, have your son plug in the high pressure pump while u watch the gauge on the fuel should jump up a bit then stable out... it works then!!!!
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