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Old 03-29-2011, 07:40 AM
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Join Date: Feb 2004
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function of fuel pump driver module (fpdm)?

i did the search and read all of the failures and symptoms of the fpdm going bad. it is obvious that it supplies power to the fuel pump. is it just a relay? what other function does it have? how does it work? if i had a schematic i guess it would be obvious.
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Old 03-29-2011, 09:41 AM
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Imo I think it works much like the ETAC fan controller. It receives a digital request based on what the fuel rail pressure sensor is seeing and then uses pulse width modulation (varies the voltage supplied and ultimately the speed of the pump) to control the fuel pumps output to maintain the desired fuel rail pressure.
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Old 03-29-2011, 09:52 AM
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Quote:
Originally Posted by City of Champs View Post
Imo I think it works much like the ETAC fan controller. It receives a digital request based on what the fuel rail pressure sensor is seeing and then uses pulse width modulation (varies the voltage supplied and ultimately the speed of the pump) to control the fuel pumps output to maintain the desired fuel rail pressure.
that would make sense and explain the different types of failures. if it were a pure relay then it could give reduced voltage but more than likely just fail.

sounds like another weak spot in the truck, similar to the solenoid for the 4 wheel drive iwe.

what a place to put something like that and what a way to mount it. would have been much better to install inside on the back cab wall. would be harder to get at but it would be protected and probably last forever.

thanks for the reply
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Old 03-29-2011, 11:30 AM
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The main purpose of this highly complex device appears to be to leave you completely stranded at the worst possible time and place. That said, it does one heck of a job of it.
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Old 03-29-2011, 11:45 AM
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Quote:
Originally Posted by projetmech View Post
what a place to put something like that and what a way to mount it. would have been much better to install inside on the back cab wall. would be harder to get at but it would be protected and probably last forever.
I think the electronics must put off some heat that needs to be dispersed during operation... why else would they have bolted it to that big chunk of aluminum? Aluminum is expensive so they didn't do it for S&Gs.

One of the other indications that it gets warm is that its not integrated into the fuel pump. The lowest cost solution would probably be to put these controls into the pump (fuel sending unit) itself. But if it puts off heat then you don't want it inside a tank of gasoline.

This would also be the reason its out in the elements, instead of in the cab. If it was enclosed with no air movement then it could overheat.

Just my educated guess as an automotive engineer. My realm is brakes, not fuel systems.
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Old 03-29-2011, 04:34 PM
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I very much agree with that, the etac fan controller get hot as hell! I used to have a blister to prove it
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Old 03-29-2011, 09:22 PM
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According to the FSM:


The FPDM receives a duty cycle signal from the PCM and controls the fuel pump operation in relation to this duty cycle. This results in variable speed fuel pump operation. The FPDM sends diagnostic information to the PCM on the fuel pump monitor circuit. For additional information, refer to PCM Outputs, Fuel Pump and PCM Inputs, Fuel Pump Monitor in this section.
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Old 03-29-2011, 09:22 PM


 
 
 
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