The 1996 lineup of Chevrolet trucks included the Silverado 3500 crew cab. Chevrolet produced the truck with an optional 6.5 liter eight cylinder fuel injection engine. The 3500 truck also included many different standard features including a chrome step bumper, power brakes, air conditioning, power windows, power door locks and four wheel anti-lock brakes. Because these Chevrolet diesel engine pickup trucks are made up of so many different parts it can be tough to find what part to replace or repair when you have a problem. Two ways to troubleshoot the vehicle are to look at manufacturer recalls and to use general troubleshooting techniques.
Check your truck's fuel filter if you see gasoline leaking underneath the truck. Your truck may have a Fram fuel filter installed in it that was not properly manufactured according to Chevrolet's specifications. As a result, the o-ring of the filter may not seal properly on the fuel line running to it. This inadequate fuel line seal could result in fuel leaking from the line and down through the engine of the truck. If the fuel comes into contact with an ignition source it could start a fire inside the engine. Replace the fuel filter to resolve this issue.
Inspect the air level inside the brake hydraulic system and hydraulic fluid level when the truck has a spongy feel to it when you are pressing the brake pedal. Air could be leaking from the system or you may not have the right type or enough brake fluid to allow the brakes to work properly. You should also examine the brake master cylinder to ensure that it has not become broken or damaged. The front and rear brake pads and shoes could also be worn or damaged. The problem could also be caused by a clogged, kinked or damaged brake hose or the uneven wear of one or more of the truck's brake drums.
Look at the rear axle shaft seal when you see an oil leak near the rear wheel area of the truck. The axle shaft seal may have become warped or broken and should be fixed. If the shaft seal is still working properly the pinion seal could also be the problem. Make sure that the seal is still holding oil properly and has not become damaged or faulty.
