Does my 88 F-150 have TWO fuel pumps?

I have a 1988 F-150 300 - six cyl engine, fuel injected, 4WD, manual tranny, pickup truck.
I'm not getting fuel to the engine. I *can* hear the fuel pump in the gas tank run.
This could be gas line freezeup, because it was bitter cold when it quit running. I was going down the highway about 50mph when it just quit. This was after driving about 40 miles. I tried to restart it, it started and ran for a half minute and would not start at all after that.
The gas tank was half full, I poured in 3 more gallons just to be sure the gauge was not stuck or wrong. It WILL run for a brief time when I pour some gas in the intake, so it's not electrical, and definately IS a fuel problem.
Someone said that some of these trucks have a second HI-Pressure fuel pump on the frame, under where the drivers feet are inside the truck. (plus the one in the tank). Because the truck is not here, I can not check, nor do I really know what I'd be looking for. I cant understand why it would need TWO pumps.
I looked on the web, but could not determine if it does, since most of what I found was pretty generic info, or for the wrong year truck. Is this possible? Why would there be 2 pumps, and what does it look like if there is one?
Thanks for all help.
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On Fri, 28 Dec 2012 17:10:24 -0600, snipped-for-privacy@garage.com wrote:

"injection" pump - but I do not believe your F150 was set up that way. You most likely have a frozen fuel line or filter. An extra 8 oz or so of Isopropyl or ethanol based fuel line antifreeze will likely thaw it out in an hour or two. Do NOT use methanol.
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snipped-for-privacy@snyder.on.ca wrote in wrote:

Yes 88 should have 2 pumps. the second one is directly under the drivers side inside the frame rail right before the frame kickup. I would check the fuel filter first though. KB
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Kevin beat me to it, but the fuel filter was going to be my suggestion also. I had an old Plymouth Fury that had similar symptoms; it would run good for a few minutes/miles, then die. Let it sit for a while, and it would run fine again for a while, then stutter and stall.
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the fury had a 3.5 psi fuel pump mounted on the engine that had to draw the fuel all the way from the tank and push it through the filter. The F150 has a pump capable of producing 90PSI or more. If it is a dual pump sytem the tank pump is a 3.5 psi (+/-) pump making sure the high pressure pump is always supplied with fuel. Not sure if the filter is between the pumps, or on the high pressure side.
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If the '88 is like the '96 (I have the CD for it), the filter is under the driver's seat, so I would assume that would be between the pumps. Granted, the Fury was a NA vehicle with a single pump, but a clogged filter is a clogged filter, and should exhibit the same symptoms if it's starving the engine for lack of fuel.
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On Fri, 28 Dec 2012 17:10:24 -0600, ford-owner wrote:

Most likely, it does have a high pressure pump on the frame rail.
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wrote:

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On Sat, 29 Dec 2012 19:15:35 -0500, snipped-for-privacy@snyder.on.ca wrote:

I just learned about that inertia shut-off switch. I was told it's under the glove box, but I'm not sure just where.
I ended up taking the truck to a mechanic. He found the fusible link that supplies power to the fuel pump was burned up, as well as a short section of the wire after it. This came as a surprise, because I heard the fuel pump running in the tank. But the truck runs now. I can see the replaced fusible link near the fuel pump relay.
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