Fuel System Issues (despite new pump and filters):
* Fuel pressure regulator: A faulty regulator could allow excess fuel to leak into the intake manifold or even back into the fuel tank, causing the gas smell and high fuel consumption. Low fuel pressure could explain the low power.
* Fuel injectors: Clogged or leaking injectors can cause a rich fuel mixture (too much fuel), leading to poor performance, high fuel consumption, and a gas smell.
* Vacuum leaks: A leak in the intake manifold vacuum system can draw raw fuel into the intake, causing a strong gas smell and potentially affecting engine performance. This is especially likely given the combination of symptoms you describe.
* Faulty fuel lines or connections: A leak in a fuel line anywhere between the tank and engine can cause a gas smell and fuel loss. Check all lines and connections carefully for cracks, damage, or loose fittings.
* Evaporative Emission System (EVAP) leak: A leak in the EVAP system can allow fuel vapors to escape, resulting in a gas smell. A large leak might even affect fuel economy slightly. However, this is less likely to cause the other symptoms.
Brake System Issues:
The sensation of the brakes being on suggests a problem *separate* from the fuel system issues, but they can be related by coincidence.
* Brake caliper(s) sticking: A seized or sticking caliper piston will cause constant drag on the wheel(s), resulting in reduced fuel economy and a feeling that the brakes are engaged. This is a serious safety concern. Thorough inspection is necessary.
* Brake lines or hydraulics: Although less likely to cause a consistent dragging sensation, a leak or restriction in the brake system could contribute.
* Parking brake: Make absolutely sure your parking brake is fully disengaged.
Other Possibilities:
* Catalytic converter: A clogged converter can restrict exhaust flow, leading to low power and potentially affecting fuel consumption. However, this typically wouldn't cause a strong gas smell.
* Ignition system problems: Weak spark from worn spark plugs, wires, or ignition coil could contribute to poor engine performance, but is less likely to cause the gas smell.
* Oxygen sensor: A faulty oxygen sensor can lead to an incorrect fuel mixture, affecting fuel economy and power.
Troubleshooting Steps:
1. Safety First: The gas smell is a significant safety hazard. Do not operate the vehicle in an enclosed space. Have the problem addressed by a qualified mechanic as soon as possible.
2. Check for obvious leaks: Inspect the fuel lines, connections, and the fuel tank for any visible leaks.
3. Inspect brake calipers: Visually check the calipers for signs of sticking or binding. You might notice heat build-up in a affected wheel.
4. Professional Diagnosis: A mechanic with experience with older vehicles can use a fuel pressure gauge, a vacuum gauge, and a scan tool to diagnose the problem more accurately. They can also check for EVAP system leaks.
Don't delay getting this checked out. Driving with a strong gas smell is extremely dangerous, and the brake issue is a safety hazard. A qualified mechanic is the best resource for diagnosing and fixing the combined problems.
