What is so great about FASS ???
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Joined: Oct 2002
Posts: 7,543
Likes: 4
From: Tomball, Texas
Originally Posted by Stump
Ok S.D. after reading and reading all of the info on the walbro conversion I am finaly going to do it. No reason to go through all of the bs with getting a new lp installed, and not doing it the right way. 
I don't seem to have any problems with mine now but don't want to either. I have ordered a new walbro pump, the tapped banjo bolts and a fass adapter from rip. I can get all the rest here, the one and only thing that really has me worried about the whole thing is the way I am going to power the new pump. I have not read or I missed sombody doing this on a 04. Can I just cut the wires on the old lp and extented it to the walbro and all is good? I really don't know any thing about relays and how they work, so if that is needed, might need to do baby steps with me so I can understand. Any help or comments with heads up from all who have done this would be great. Thanks "D"
I don't seem to have any problems with mine now but don't want to either. I have ordered a new walbro pump, the tapped banjo bolts and a fass adapter from rip. I can get all the rest here, the one and only thing that really has me worried about the whole thing is the way I am going to power the new pump. I have not read or I missed sombody doing this on a 04. Can I just cut the wires on the old lp and extented it to the walbro and all is good? I really don't know any thing about relays and how they work, so if that is needed, might need to do baby steps with me so I can understand. Any help or comments with heads up from all who have done this would be great. Thanks "D"You shouldn't use the power for the original lift pump to run the Walbro. You will need a relay to feed the Walbro. The original lift pump power feed will be used to trigger the relay. Hook up the relay to a 12v power source (preferably the battery) and the output to the Walbro.
MikeyB
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Joined: Apr 2004
Posts: 3,241
Likes: 1
From: NW Indiana
MikeyB, I don't know if I'd do that because the ecm sends different voltages to the stock setup. It's not a direct switched 12volts. The voltage varies, from what I've read. If you do this, you'd most likely burn up the relay or it just plain won't work. You've got to find a switched 12volt source such as the cigarette light circuit. Something that is hot only when you turn your key on. Use this to trigger the relay. Pull a direct hot off the battery and fuse it seperately to the relay then thru to the pump.
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Joined: Oct 2002
Posts: 7,543
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From: Tomball, Texas
Originally Posted by trik396
MikeyB, I don't know if I'd do that because the ecm sends different voltages to the stock setup. It's not a direct switched 12volts. The voltage varies, from what I've read. If you do this, you'd most likely burn up the relay or it just plain won't work. You've got to find a switched 12volt source such as the cigarette light circuit. Something that is hot only when you turn your key on. Use this to trigger the relay. Pull a direct hot off the battery and fuse it seperately to the relay then thru to the pump.
To a relay trigger I don't think the PWM will matter since the coil has been energized and takes time for the field to collapse when the power is removed.
But the main power source to the relay needs to be a constant 12v, like from the battery (and fused).
MikeyB
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Joined: Jan 2004
Posts: 843
Likes: 1
From: Kansas City, MO
I personally like the concept of RASP.... engine driven positive displacement gear pump. Pump output increases with engine speed. Parallel system so that if a belt breaks, the electric lift pump automatically energizes and light comes on in the cab. I am not all that keen on the idea of having to trim the fan blades or the high price tag, though.
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Joined: Apr 2005
Posts: 249
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From: Wisconsin
Originally Posted by Gypsyman
Pick up the extension harness (p/n 4025182) pictured below from Cummins. Plug one end into the factory lp harness, cut the other end off and use it for trigger and ground on the relay. This way the ECM will see a closed circuit just as it can see the factory lp.
Richard
Richard
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Joined: Feb 2005
Posts: 21
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gypsyman I just went and picked up the extension harness from cummins, it's total was $16.87. Now I just need to order the relay kit, or could I just pick up any 40 amp relay from an auto parts store tomarrow instead of ordering it?
Hope that this all I need!
Might need some guidence when I am installing the relay to the extension harness and were to go looking for the constant 12v supply.
You said the 2 wires from the new harness hook up to the terminals 85 and 86, does it matter which one goes on which one? I am woried I am going to fry something on my truck can you tell?
Thanks guys for all the help!
"D"
Hope that this all I need!
Might need some guidence when I am installing the relay to the extension harness and were to go looking for the constant 12v supply.
You said the 2 wires from the new harness hook up to the terminals 85 and 86, does it matter which one goes on which one? I am woried I am going to fry something on my truck can you tell?
Thanks guys for all the help!
"D"
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Joined: May 2003
Posts: 830
Likes: 0
From: Spokane, Wa
Originally Posted by Stump
Might need some guidence when I am installing the relay to the extension harness and were to go looking for the constant 12v supply.
You said the 2 wires from the new harness hook up to the terminals 85 and 86, does it matter which one goes on which one? I am woried I am going to fry something on my truck can you tell?
Thanks guys for all the help!
"D"
You said the 2 wires from the new harness hook up to the terminals 85 and 86, does it matter which one goes on which one? I am woried I am going to fry something on my truck can you tell?
Thanks guys for all the help!
"D"
With all the interest in this I'm considering putting together a kit with everything included and pre-wired. I'll try to price everything out over the next few days and see if it would be feasable from a cost standpoint. I'm not even sure there would be enough interest at this point but I've got some time to kill.
Richard
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Joined: Feb 2005
Posts: 21
Likes: 0
You guys are great! Thanks for all the help and thanks to superduty for setting this up. Now I know that I won't have any fuel problems as long as the filter is clean! I won't be able to do this till this weekend but hopefully I have all the info I need. If not I know that you all are here to help.
"D"
"D"
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