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\ For those that didn't get to see what came out when I pulled the cover off. 😆🤯

It hit so hard when the cross pin snapped that it blew the hubcaps off! But the REAL racket was the driveshaft flailing around when the yoke shattered. It beat the hell out of my muffler and new side gas tank before it finally came free.

Thats the max weight (loaded) 8,600 is a manufacturer weight rating for compliance. It's the Goldilocks zone. Above 8,500 for no emissions, and under 9k where most states would make you register as a commercial vehicle.

Tare weight 6250. I have two giant job boxes in the back full of tools. I know the big one tips #800 when I lift it out with the forklift that has a built in scale. The other one is around 400, by the fact that I can only lift one end at a time. You tell me! 👂 ETA, remember how much torque my 460 is making at ~2,800 rpm (70 mph). 🤯

With earlier systems rear was default and the mid-ship was only selected with power applied. This "Hot Fuel Handling" version uses a switch valve that is driven either way, but remains stable state until the power & ground are reversed. Let me look at the schematic and try to explain the troubleshooting at the back, in terms you can understand.

There are no solder connections in a harness. All splices are pressure welded (copper on copper). 💡

Okay, the dash switch sends power to the switch valve, which moves the contacts inside and switches the senders. I assume you want to know why the switch won't move the valve to 'front', correct? Seems Vivek already got to the switch pin out.... If you ask the right question, I can give you the correct answer. 💡 You'll notice a rectifier (pair of diodes) in the rear tank feedback loop driving the valve's motor, which selects the senders. Trouble shooting is at the end of each chapter. (I'll include that... for example) and the ground locations/illustrations are at the front of the book. Now, the pumps.

Truck "yard art"...😉😂 It's recycle night on my street, and that R&P is a heavy chunk! Here's some more pics of the damage done by a 7,000 truck at 70 when something let go. 🤪 🤣🤣🤣🤣

I'm sorry folks. There was a bit of a palaver out in the street. Cops were called on me because the jac-off across the way came a hair's breadth from getting a good taste of the steel toe of my work boot. 😡 I'll get into it if you like, but for now let me open the EVTM images in tabs and compose a way to accomplish testing with the continuity/ohms portion of a DMM..... (again, it's going to take me a bit, but I promise I won't dismember anybody in the interim. )

Okay, give me a minute, because it's hard to Juggle pages and photos into a post from my phone.... 👍

The dash switch, or the switch valve?

I'm not here to chew anybody's head off. I may come off as gruff because of how autistic I am, but I don't try to hide any of that. I do the best I can, on a phone and about a half hour sleep per night. Please don't feel that I'm targeting you, Vivek! 🙂

You're not looking at the correct diagram for ,1986, dual tanks, electric pumps, 7.5l ....... These things changed. Go to the pages I pointed out and find the one that represents your truck.

There's no selector relay shown, just the switch and the valve...

But the front tank reads correctly and will drive the truck? The problem is either the switch valve, or beyond, from what you've just told me Try jumpering around the valve, and see if the rear tank works.

Your buddy did the snow angel, full on screaming fire chicken impersonation on the hood of his car? 🤪

Every ICE on the road in the last 38 years has electric fuel pumps. They can be very reliable (I don't understand the hatred?)

Have a look in the 1986 EVTM. https://www.garysgaragemahal.com/1986-evtm.html Section 18 (pg 95-101) is for the selector and senders Section 19 (pg 102-107) is the safeties/crank bypass and pump control. Grounds can be found somewhere in the front of the book. What problem do you have?

It opens at WOT, when the temperature controlled snorkel may not provide 700+ CFM Vacuum should go to a colored velay valve by the dizzy, and then back to the motor inside the plastic scoop.

I've fixed a lot of old Onan's on sailboats back in the late '70's- early '80's but never an underslung one like that. Back then they were transitioning to Subaru Robin engines, which seemed much more reliable but hard to find parts for here in the states. I did know a few ex-pat Brits down in the islands, but parts were slow to get, and Japanese dealers were non-existent. Good luck! I'm following to see where this leads ...

BTW, best I can tell, it's a 0.020 shim under the pinion bearing race.

Yeah, that's definitely what I'm describing.... Thank you! Now the race to find one!

Gary, the way I do is quite simple: • Copy the text+picts from the web page; • Paste it in a new empty Word doc; • If I want to get rid of the pictures hyperlink, I download each pict from the web page and use these to replace the “hyperlinked” ones in the Word doc; • Make some final Word doc touches and layout adjustments; • Save the Word and make also a PDF of it. I’ll do it with the Web references you made here ans send the Word and PDF to you. PDF is good, Microsoft links are ABSOLUTELY anenthema to me.... Look at the fun I'm having, finding "a washer"...

As some of you may already know, I have big problems getting pages and Word documents to load from this site. So, I can view this PDF illustration but I can't get the parts lists to load. (I need a complete number for 4670 85/ Ford WDD Non- Locking 10.25 Full Float Axle) Parts list 258.... This little slinger was chewed to death by the pinion splines when I blew up my rear end. It slipped through the cracks when I clamored to order gears, shims and bearings. Interesting failure analysis on this one.... 🧐 More telling is the pinion shim! It's obviously spun. (The faces of the NEW Koyo bearings are ground completely flat, as is the back of the pinion gear. Yet, this thing has spun between the inner race (that is pressed on) and the gear itself... Since I have all OEM parts, I'm going to start with the idea that shims are to correct for vagiaries of case machining, and use that as a baseline. If I can't get a good pattern I'll torch the race back off and correct the shim(s) Thanks

Welcome! I really love the I-6 in a 250 truck! Does your truck have New Process gearbox and TC? We love family projects, and definitely have the old timers and documentation to help!