Recent content by jcwren
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Fixing fuel gauge after deleting 2nd fuel tank?
I went through the schematics and figured it out. I had posted this on Farcebook in the GMT400 3500HD Trucks And Enthusiasts group, but didn't follow up here (sooo many social media platforms...) Not sure why a kit would be necessary, unless someone is just out to make a buck. Disconnect the...- jcwren
- Post #4
- Forum: Audio + Electronics
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'99 7.4L, what is this sensor?
It's the GMT-400 manuals. I attempted to join the gmt800.com forums to try to find the 2000 GMT-800 FSMs, but I can never get it to send a confirmation email. I also had a lot of trouble getting this forum to send me one. Not sure why, the emails are going to a gmail account, and they're not...- jcwren
- Post #31
- Forum: Engine Performance + Maintenance
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'99 7.4L, what is this sensor?
Well, what's odd (actually, more annoying than anything) is that the truck doesn't match the '99 FSM for some things. Here's an example: The '99 FSM shows this wiring diagram for the fuel balance module. The 2nd wiring diagram actually matches what's on the truck, but it's ONLY that one image...- jcwren
- Post #29
- Forum: Engine Performance + Maintenance
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'99 7.4L, what is this sensor?
Turns out this is technically a GMT-455 truck, and according to this link, "The Flint 3500hd line started in 1997. Only Summit White cabs sold for domestic use were produced here. All other 3500hd units were still produced at the Janesville plant." I guess since the paint code on the RPO sheet...- jcwren
- Post #27
- Forum: Engine Performance + Maintenance
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Fixing fuel gauge after deleting 2nd fuel tank?
My '99 3500 HD (7.4L/4L80E) was originally equipped with dual tanks. I'm unclear if one of the previous owners deleted the rear tank or or whatever company put the dump bed on did it (though I suspect it wasn't them). The problem is the fuel gauge is always indicating empty and it's throwing a...- jcwren
- Thread
- Replies: 10
- Forum: Audio + Electronics
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4L80E w/ Transmission Drum E-brake Leaking
I think these are good enough that I see what I need to do. Probably get some 3/16" plate, cut out a bracket, and weld a tab with a gusset on it. According to the FSM, the brake tension is set to 50 pounds of tension, and 3/16" plate will have no trouble with that. All I need to do now is roll...- jcwren
- Post #26
- Forum: Transmissions
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4L80E w/ Transmission Drum E-brake Leaking
Der Lastwagen :) The top of the box (that flat area) is being cut off to make it a more useful dump truck.- jcwren
- Post #24
- Forum: Transmissions
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'99 7.4L, what is this sensor?
Very close. XF, not XJ :) Curiously, there is no door jamb sticker. And I don't see any faded paint, sticker residue, etc to indicate where one might have been. It has the federal compliance disclaimer sticker, but that's it. It had a USDOT number at one time, and I'm would have thought the...- jcwren
- Post #25
- Forum: Engine Performance + Maintenance
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4L80E w/ Transmission Drum E-brake Leaking
I am at least happy to report that replacing the rear seal and/or cleaning up the corrosion on the yoke has so far appeared to fix it spewing ATF everywhere. Now to fix the remaining dozen issues... Leaking oil pressure sender (that's a whole 'nother thread), knock sensor(s), O2 sensors...- jcwren
- Post #22
- Forum: Transmissions
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'99 7.4L, what is this sensor?
Lots of good stuff there, thanks! I wonder if I can use a endoscope camera to get a look at the block stamping. It's probably crudded over, but it's worth a try. Here's the RPO sheet from the truck. The VXT option probably explains why the VIN decoders will only do a partial decode on it.- jcwren
- Post #23
- Forum: Engine Performance + Maintenance
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'99 7.4L, what is this sensor?
I'm not sure of the assembly date, I don't have a door sticker. Do you know of anywhere else it might be? I'm still learning about these things, but this was based on the old guy at the auto parts store who generally knows his stuff (a real auto parts store, not Autozone/Advance). He said the...- jcwren
- Post #20
- Forum: Engine Performance + Maintenance
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'99 7.4L, what is this sensor?
I've never seen a power steering system that has any connection to the engine block (as far as fluid and such). Given the location shows as "oil galley plug" in the FSM, I now believe it's a late model change that moved the oil pressure sensor. The easy test will be to disconnect it and see if I...- jcwren
- Post #18
- Forum: Engine Performance + Maintenance
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'99 7.4L, what is this sensor?
No, this is definitely into the side of the block, right at the front edge. According to the FSM, there's a bolt there for an oil galley plug. I just can't find any documentation for an oil pressure sender being installed there, in either the engine parts diagrams or in the wiring diagrams.- jcwren
- Post #13
- Forum: Engine Performance + Maintenance
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'99 7.4L, what is this sensor?
OK. But according to the factory service manual, oil pressure should be coming off the "fuel pump oil pressure switch and sender", which is located at the rear of the block on the drivers side. I did check both the '98 and '99 FSMs, and don't see it. I've seen other discrepancies, like the 7.4L...- jcwren
- Post #3
- Forum: Engine Performance + Maintenance
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'99 7.4L, what is this sensor?
I'm 99.44% sure this is an oil pressure sensor, but I'm not sure why it's here. This is right at front of the block on the left side, just behind the power steering pump. The FSM doesn't make any reference to it, and in the parts diagram this location is listed as "oil galley plug". The oil...- jcwren
- Thread
- Replies: 31
- Forum: Engine Performance + Maintenance
