Engine and Exhaust
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John's 4X4 Center Tech Question On Your Fuel Pump
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John's 4X4 Center Tech Question:I was driving on a local Boulder road and my vehicle started sputtering. And then the engine finally quit and I couldn't get it started. I was towe...
Published on: Jun 28, 2026
Fuel Injector Cleaning At John's 4X4 Center In Boulder
Something we hear quite frequently from Boulder residents is that their fuel economy is down and their vehicle just doesn't have the pep it used to. When that happens, one of the things we look f...
Published on: Feb 23, 2025
Fuel System Cleaning At John's 4X4 Center In Boulder
Fuel, whether gasoline or diesel, is delivered to your engine to be burned to generate the power needed to keep you moving. This fuel leaves a residue as it moves through your fuel system. ...
Published on: Dec 01, 2024
Better Service At John's 4X4 Center For Better Fuel Economy
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Boulder drivers who maintain their vehicles make them more efficient. A car or truck that is well-maintained works the way it was designed to, and that means it uses less fuel and...
Published on: Jul 14, 2024
A Clean Fuel System In Boulder
Your fuel system encompasses everything it takes to get fuel from your tank to your engine. Starting with your fuel pump, which is in the tank, there are the fuel lines, fuel filter, throttle as...
Published on: Mar 14, 2024
Fuel Saving Tip: Fuel System Cleaning at John's 4X4 Center in Boulder
A lot of gas is wasted in dirty fuel delivery systems. Let’s start at the tank. The gas tank gathers of dirt, rust and sediment over the years. That’s why there’s a...
Published on: Nov 18, 2023
Time To Take Another Look at Diesels
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If you haven't looked into diesel engines lately, you may be interested in today's post. Why should you care about modern diesel engines? Fuel efficiency, for starters. Because di...
Published on: Oct 12, 2023
How To Save Gas In Boulder
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High gas prices have hit most of our budgets in the Boulder area. If increased fuel costs are consuming a bigger portion of your budget, you may be tempted to skimp in som...
Published on: Jul 27, 2023