Replaced the fuel pump relay and pump.there is a smell of gas when its starts to crank over The car still turn What else can it be 1991 240 Volvo?

It's great you've replaced the fuel pump relay and pump, but the fact you're smelling gas during cranking suggests a different problem. Here's a breakdown of potential causes and how to troubleshoot:

1. Fuel Leak:

* Fuel Lines: Check all fuel lines for cracks, leaks, or loose connections. Pay close attention to the lines leading to the fuel injectors.

* Fuel Rail: Inspect the fuel rail for leaks, especially around the injectors. You might see fuel dripping or pooling around these areas.

* Fuel Filter: Ensure the fuel filter isn't cracked or leaking.

2. Fuel Pressure Regulator:

* Diaphragm Failure: A faulty fuel pressure regulator diaphragm can allow fuel to leak into the intake manifold during cranking.

* Vacuum Line: Check the vacuum line connecting the regulator to the intake manifold for leaks or cracks.

3. Injector Issues:

* Leaking Injectors: Worn or leaking injectors can spray fuel during cranking, leading to a strong gas smell.

* Injector O-Rings: These small seals can degrade and allow fuel to leak.

4. Fuel Vapor Canister Purge Valve:

* Stuck Open: A stuck-open purge valve can release fuel vapors into the intake manifold during cranking, causing the smell.

Troubleshooting Tips:

* Visual Inspection: Thoroughly inspect all fuel system components for any signs of leaks or damage.

* Pressure Test: Use a fuel pressure gauge to check fuel pressure. If it's too high, it could indicate a regulator issue.

* Sniff Test: Carefully smell around the fuel lines, injectors, and fuel rail during cranking to pinpoint the source of the leak.

* Leak Detection Dye: Add a leak detection dye to your fuel tank to help identify leaks more easily.

Safety Note: Fuel is highly flammable. Take precautions to avoid sparks or open flames while working on the fuel system.

Additional Considerations:

* Carburetor Issues: If your 240 Volvo has a carburetor, a faulty carburetor can also cause a fuel leak and smell.

* Environmental Factors: Be sure to check for any external fuel spills that might be contributing to the smell.

Professional Help:

If you're unable to pinpoint the source of the leak, it's best to take your car to a qualified mechanic. They will have specialized tools and experience to diagnose and repair the issue safely and efficiently.