I have maintained this thing as well as any other gas powered truck I've had,and spent hundreds more on it,trying to keep it able to start in the winter by replacing numerous glow plugs,buying anti-gel and injector cleaner,and the fact I'm unfamiliar with the 6.2's as far as never having replaced a water pump--- (which looks like NO fun,set up like a Caddy or Buick with long thin bolts that will probably bust off in the block),and me not ever having replaced an injector pump, makes me unwilling to learn how too now,even if I could bend over under the hood for hours and do it. I just assume keep the diesel in it,IF I could keep it going "economically"..which is a myth in my opinion,when it comes to a 6.2..the one in my truck has never gotten over 15 mpg no matter what I do with it,empty,loaded,plowing,etc..its just a 3 ton ingot.. You cant expect miracles as far as mpg with 6.250 lbs empty,to haul around. I have had SBC and BBC powered square bodies that did as well as far as MPG--even if I got only 12 mpg I'd be ok with that--I do not go far very often....diesel fuel costs at least 50 cents more per gallon here also,it has topped $4 a gallon in the past--now it's about $2.85..Gas is only $2.35 ..so you don't "save" much there.. And if you run out of GAS,you just dump in more,and crank it over for 10 seconds and it starts right up again..no bleeding,no dead pair of batteries,no potential starter frying involved.. But with the cost of something like an injector pump being $500,more than the truck is probably worth to anyone but me,I cant see dumping that much money into a potential pile of scrap iron if it decides to grenade shortly afterwards.. Other stupid little items on the 6.2 are ridiculously expensive and hard to source..a CDR valve is about extinct now,if you do find one for sale its close to $100--same deal for the VRV valve that controls the vacuum to the TH400 modulator,and the vacuum pump on this thing has failed repeatedly,one I got from a member here lasted the longest,those are also well over $100.. The HPCA switch on the IP is also over $100..and few used ones are available,salvage yards wont "break up" parts off a running 6.2 and the few I've seen in boneyards are picked clean,probably before they got hauled in.. I also have not done much more than put glow plugs and filters on this thing,I'm scared to touch the injectors due to the lines being rather flaky and likely to twist off--I have some spares a member sent me a few years ago,but I'm not going to be able to climb up into the engine compartment to install them..so I drive with the fear one might spring a leak someday..I coated them with grease to delay further corrosion.. The oil pan has been rotted out and patched up for years with fiberglass bondo and RTV, I have 2 good used pans on hand,but cant lay under it long enough to try replacing it.. The exhaust manifold on the passenger side now has a rot hole in the center section..that is a miserable suck pill to change,I have never fully recovered from having to torch and sawsall the drivers side one off 2 years ago..and it was a good thing I had a blown up parts motor,because those manifolds are hen's teeth in salvage yards and if you see a new one online,they sell for over $400.. I'd yank the engine out rather than lay over the fender or under it for days trying to install those parts--and likely be unable to succeed in doing it..(Pulling the engine may not be possible in my condition now either,but it would still be less work and make those repairs easier with it out )...but if I took it out,I'd be very tempted NOT to put it back in.. I've had small blocks apart down to bare blocks several times,I know them inside and out,and being familiar with them makes me much more confident I can fix "everything" on them..the water pump and timing chain can be done in an hour or so,try that on a 6.2..bet the pump costs triple for the diesel too..and the one on mine could fail any day,its been on it the 16 years I've had it,it might even be original.. Take the truck to any of the garages here and they cringe,and give you a outrageous "estimate" because they want no part of working on a 35 year old truck with a "rare" diesel that has a lot of rot and rust..so I have to deal with fixing it myself,and am less able to with each passing year.. I have had probably a dozen trucks with small and big blocks and I didn't have any real issues with them,and I used them to commute 70 miles to work & back daily..carbs don't bother me a bit,I prefer a hand choke and do not mind sitting a few minutes after a cold start to let it warm up..carb icing was an issue at times,but I was able to deal with that ..as for EMP's,I have point style distributors..they may not work after one,the diesel may have the advantage there..but that is probably not going to happen .. I do like the diesel's throttle response and how it runs (or used to) after a cold start,no choking ,no hesitation or lean spit backs taking off,but all the other disadvantages to me make it not worth having.. The lowly 307 engines I have with dinky 2 bbl carbs are rated at 200 HP--the 6.2 is 140 HP...torque on the 307 is 300 ft/lbs,the 6.2 is lucky to make 240 ft/lbs..though the diesel makes that torque at a much lower RPM that the 307.. The truck probably has low enough gearing to not make much difference as far as plowing goes,I've had 305's and 350's that had no trouble at all,in high range,with 3:08 gears..I find a weaker engine and high gears actually plows better ,it cant spin the tires as easily.. I'd be happy with a straight six too,it would be sufficient for my uses,but trying to find any here is difficult..most got thrown away in perfect condition to swap in a V8 decades ago..wish now I had hoarded the ones I had given to me that ran perfect now.. I have not changed the air filter on this truck in a long time,but unless its full of mice nests or nut shells,it should be fine,I've only driven it about 5000 miles since it was replaced..I will take a look at it just in case.. If may just be a rubber fuel line has collapsed or some other fuel related issue ,like water,jelling,or a blocked up fuel filter,dying lift pump (another S-O-B_ to replace!)..I don't know.. I'm just hoping to keep this thing limping along until spring when the weather is warm enough to tear it apart,I will probably be putting my van back on the road,or buy some other daily driver to use while its apart..unless someone makes me a decent offer for it as-is.. I'd rather keep it in a way,its emission exempt being so old,no computers,sensors or check engine lights or other BS to put up with..