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Diagnostic Dilemma: The Case of the Missing Code

When doing mobile diagnostic work, no-code stalling complaints are a major part of your agenda. In most cases, the client shop is simply too busy to duplicate the failure or, in some cases, a long test drive will yield nothing in the way of useful...

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Secondary Ignition: The Art of Spark

What is a coil? From the beginning of the internal combustion engine, several different ignition systems have been used to create a high-energy spark. The most popular system, and the one that’s in use today, is a step-up coil. A coil is nothing...

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Diagnosing Catalytic Converter Failure Symptoms

Although construction can vary according to engine application, the common three-way catalytic converter contains a reduction and oxidation stage. To create maximum surface area, each stage is generally a ­ceramic or stainless steel honeycomb substrate...

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Electronic Proportioning Valve: Doing More With Less Hardware

Anti-lock brake systems (ABS) and the HCU are replacing proportioning, combination and other valves to change the braking forces in the front and rear. This is called Electronic Brake Distribution (EBD) and it can dynamically change the proportioning...

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NHTSA’s GM Brake Line Corrosion Investigation: Reading Between the Brake Lines

There will be no recalls on some GM vehicles for brake line corrosion. Instead, we received an advisory from the National Highway and Traffic Safety Administration (NHTSA) about brake line inspection and car washes. What was not discussed was the corrosion...

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2007-2011 Ford Expedition and Navigator Air Suspension

The Ford Expedition air suspension does more than just lift and raise the vehicle. The system levels the vehicle under loads and when a trailer is attached. The system uses only two air bags on the rear axle unlike previous models with air bags on all...

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MAZDA: Timing Belt & Chain Replacement

This month, we’re going to be looking at the ­timing components on the Mazda line of vehicles. We’ll be focusing on timing belts since they are considered a service item and will present the greater amount of opportunity for replacement. Then, we’ll...

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Honda Element Brake Job

It may look like a car that was never removed from the box it came in, but the Honda Element isn’t boxy when it comes to the brakes. Based on the CR-V platform, there is also nothing tricky when it comes to service. But, its brake system is hardware...

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The Changing Maintenance Market: New Technologies Mean More Opportunities

Most of us wake up each morning, not ­realizing that our professional world has changed even as we slept. Our first job of the day is to service a ­vehicle equipped with an oil life monitor. Not only do we discover that modern oil life monitors can...

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Converter Codes: How Long Will the Light Stay Out?

OBDII systems with faulty catalytic converters will normally store a diagnostic trouble code (DTC) when the converter begins to fail. The OBDII converters use an upstream and downstream oxygen sensor to measure the differences in oxygen content between...

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Maintaining Your Spray Guns

If there’s one piece of equipment that epitomizes the painter and the paint shop, it’s the spray gun. Over the years we’ve seen many spray guns. Although there are operating principles and functions that remain the same, some have been improved...

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Wheel Bearing Adjustment Tools & Equipment

A recent survey showed that more than half of the bearings on the road today are adjusted incorrectly. A wheel bearing that’s out of adjustment can reduce bearing life and can affect more than just the bearing. An out-of-adjustment bearing affects...

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The following tip applies to all 2001-’06 General Motors trucks equipped with the 6.6L Duramax Diesel engine, RPO LB7 or LLY. There are a couple of issues with the fuel filters on these vehicles. GM has released a revised fuel filter; see TSB 04-06-04-070. The new filter is longer than the original filters used and has a plastic housing.

Note: The increased length does not change the replacement interval for the filter.

Both styles of filters include a rubber grommet located in the top of the filter. When removing an old filter, ensure this rubber grommet comes off at the same time. It’s hard to see in the vehicle and may get stuck on the filter adapter, which will not allow the replacement filter to be installed. The new style filter has a smaller inlet with a different grommet. Comparing the two, you might think you have the wrong filter, but it is correct. See Photo 1.

The other issue with the fuel filter system is that the water-in-fuel (WIF) sensor located at the bottom of the filter is made of plastic and is easily damaged while trying to remove or install it onto the filter. You should always remove the sensor and filter as a unit from the vehicle and then transfer it to the new filter.

Install the WIF sensor to the filter, only tightening it by hand. Tighten it to the point where the sensor sealing gasket just contacts the filter. Use a permanent marker and make an index mark on the sensor and the filter. Then, turn the WIF sensor an additional half turn. Once again, only tighten by hand. Do not use pliers or other tools to tighten the sensor. The replacement fuel filter should include a new seal for the sensor.

If the WIF sensor will not seal properly to the new filter, it may have been damaged during a previous filter change and you will experience a leak situation. If the WIF sensor will not tighten correctly, it will need to be replaced.

Courtesy of Nick Taylor, administrator, Mitchell 1 OnDemand5.com.

For more information on Mitchell 1 products and services, automotive professionals can log onto the company’s website at www.mitchell1.com.

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