Fuel consumption issues
Posted 10 January 2017 - 01:01 PM
Posted 10 January 2017 - 04:10 PM
6MPG is virtually impossible from a 2 liter L20B. Can't see how it would even run. Black cloud out the exhaust???
Some things to check that can in combination cause poor mileage. Generally most likely at top
1/ Fuel leak, if not the tank maybe a hard to see line or hose. Is there a fuel smell around the truck any time and after filling?
2/ Choke ON or stuck on, not shutting off
3/ Carb flooding. Float set too low. Needle valve dirty/not closing. Fuel pressure too high. Secondary jet in the primary jet position. Power valve ON at all times. air filter VERY dirty.
4/ Fuel pump diaphragm torn, gas leaking down into crank case.
5/ Ignition timing extremely retarded.
6/ Front brake caliper stuck, e brake on, drum brake dragging?... does any or the wheels get hot to the touch?
7/ Speedometer drive gear changed with replacement transmission. Mileage is reading wrong.
8/ Thermostat stuck open, engine runs too cold.
9/ Too thick engine oil
Posted 17 January 2017 - 01:42 PM
I have not smelled any fuel, anywhere. I changed the fuel filter and a few of the lines anyways. Air filter looked fine; replaced it anyways. Thermostat was replaced within the last month/1000 miles.
I ran the engine at around 3k for a minute, let it die and checked the spark plugs. The one furthest from the radiator was black, middle ones brown, and closest to the radiator white.