fuel economy

  1. Morgan90

    90 5.7 TBI fuel economy issue

    I’ve got 1990 k2500 with the TBI 350 and the NV4500 5 speed, it has been getting very bad fuel economy recently. Fully stock apart from wheels and tires. My odometer does not work but I’m only getting what I think to be around 400km (250 miles) to a tank and it has the larger 130 litre tank (34...
  2. C

    Engine Wimpy, MPG Insanity

    So I have a 1994 k2500 with a tbi 350 in it and it's sent me on a wild goose chase for the better part of this year. Right now the engine mechanically seems to run perfectly fine, but mid-acceleration it is lacking power and runs a hair rough. But when either just coming under load or upper...
  3. Nick88

    Gas Mileage

    With these trucks, gas mileage is not a strong suit, although, fuel economy can be increased for relatively cheap and especially with the price of gas, will save you a lot of money. I did some mods to my truck which helped my 350 TBI in a 1988 square body Blazer get in the 20s cruising on the...
  4. B

    Help with carb vs efi vs TBI

    hello, I’m new to the group but I read a lot on here, I’m trying to make my 94 Sierra k3500 more fuel efficient (I’m a comedian I know) it currently has a 454 TBI in it and is you’re typical dog. I know these aren’t race trucks but I want it to be able to hold its own. I also need to to...
  5. Angelo

    6.5l diesel leak dripping from bottom of starter. How to locate the problematic line

    On my 1996 K3500 6.5L diesel I noticed severe dripping from under the starter. It smells and feels like diesel fuel. The fuel lines have never been changed. I know there are return lines going back to the fuel tank. Is there a map or diagram showing all the fuel lines in this truck? I've posted...
  6. LoCascio_Inc

    Small Displacement Diesel Swap Options?

    Fred Williams from Dirt Every Day recently did a video reviewing a Quigley 4x4 2500 Express van with the new 2.8 Duramax & 8 speed automatic . He seemed very impressed with it's ability to move a 3/4 ton van and this made me wonder if other smaller displacement diesel swaps have ended up in the...

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