Tech Tip: Diagnosing Subaru Vehicles that Won't Take Fuel

Tech Tip: Diagnosing Subaru Vehicles that Won’t Take Fuel

Should you encounter a Subaru vehicle that won't refuel or causes the gas nozzle to shut off prematurely, here are some tips to aid diagnosis. The vehicle should first be checked for obvious problems, such as crushed or kinked hoses, misrouted hoses or broken components. If nothing is found, go to the gas station and confirm the condition.

Should you encounter a Subaru vehicle that won’t refuel or causes the gas nozzle to shut off prematurely, here are some tips to aid diagnosis. The vehicle should first be checked for obvious problems, such as crushed or kinked hoses, misrouted hoses or broken components. If nothing is found, go to the gas station and confirm the condition.

While at the pump, after confirming the condition, remove the hose from the canister marked FUEL TANK. Remember that there are three hoses, one for the purge (usually the smallest in diameter), one for the fuel tank and one for the drain to atmosphere after passing through the charcoal canister.

If you remove the canister fuel tank hose and the vehicle refuels normally, then the problem is most likely between the canister and the vent hose in the rear frame rail.

If you removed the canister fuel tank hose and the vehicle still won’t refuel, then the problem is most likely between that hose and the tank (remember, the split half technique from electrical class?). You will now have to gain access to the pressure control solenoid valve hose connections to split it further down to isolate the problem.

Obstructions that appear to be as slight as spider webs can cause this condition; clearing out the debris will correct this refueling problem.

Technical service bulletin courtesy of Mitchell 1.

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

You May Also Like

Manual Transmission Failure Causes

One of the most common reasons behind why a manual transmission fails is lack of lubrication.

The most common reasons behind why a manual transmission fails are lack of lubrication, incorrect lubrication and improper or no clutch release.

COMPLEXITY OF LUBRICATION

Lubrication should be simple, but in the modern world NOTHING is simple. There was a time when virtually all stick transmissions ran on 90w gear oil. The synchronizer rings were brass or bronze, the cars and trucks shifted around 3,000 rpm and we had 3- and 4-speed transmissions. Ninety-weight did not like cold weather and generated multiple complaints to the manufacturer due to cold-shift problems. You needed two men and a boy to shift one of the units on a cold day until the fluid heated up.

Wheel Bearing Hub Damage Repair

Noise is a classic sign of a bad wheel bearing or wheel hub bearing. Determining why the damage happened may take some time.

Electric Vehicle Battery Service

Don’t be afraid to work on battery packs. However, you should be mindful of the potential damage high voltages can cause.

ADAS Suspension Alignments

Look at the “big picture” and really consider how the vehicle will operate if things aren’t done correctly.

Building The Perfect Future By Mentoring

Share your stories of how you have helped others reach their goals.

Other Posts

Electric Power Steering Diagnostics

Load management for steering systems.

GRI Receives US DOT Certification For Safety

GRI tires will now incorporate the DOT code emboss on its side walls.

Active Ride Control Diagnostics

The key to servicing these systems is proper information and understanding precisely how these systems operate.

Brake Pad Errors and Mismatches

In order to make the right selection, you must do your homework while still remaining skeptical.