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Engine hard start

[Volvo 122, 140, 160, 240, 260, 740, 760, 780, 850, 940, 960, C70, P1800, S40, S60, S60R, S70, S80, S90, V40, V70 2.3Liter Turbo 2WD, V70 2.3Liter Turbo AWD, V70 2.4Liter Turbo 2WD, V70 2.4Liter Turbo AWD, V70 2.4L non-Turbo, V70 2.5Liter non-Turbo, V70 2.5Liter Turbo 2WD, V70 2.5Liter Turbo AWD, V70R, V90, XC70, XC90]

This can be caused by vapor lock or a sticking fuel pump check valve. A warmed up motor produces a great deal of external heat. Fuel must be kept cool to flow properly through the fuel lines and into the combustion chamber. If the fuel system is exposed to the engine heat, the fuel will vaporize and interrupt the flow of fuel to the motor. This is called vapor lock. A fuel pump has a check valve to prevent the fuel from flowing back toward the fuel tank and to keep some pressure to allow the motor to start easily without having to re-pump the fuel all the way to the motor. This check valve can wear over time causing it to stick and making it harder to start the vehicle.

Some reasons that would cause an engine not to start when hot could be:

Air Filter Clogged
Fuel not reaching the carburetor or fuel injection system
Injectors leaking
Corroded battery connections, especially ground

Pricing for 240 FUEL PUMP CHECK VALVE (FUEL SYSTEM)
Pricing for 260 FUEL PUMP CHECK VALVE (FUEL SYSTEM)
Pricing for 740 AIR FLAP ACTUATOR SOLENOID (CABIN FANS & RELATED)
Pricing for 740 FUEL PUMP CHECK VALVE (FUEL SYSTEM)
Pricing for 760 AIR FLAP ACTUATOR SOLENOID (CABIN FANS & RELATED)
Pricing for 760 FUEL PUMP CHECK VALVE (FUEL SYSTEM)
Pricing for 780 FUEL PUMP CHECK VALVE (FUEL SYSTEM)
Pricing for 940 AIR FLAP ACTUATOR SOLENOID (CABIN FANS & RELATED)
Pricing for 940 FUEL PUMP CHECK VALVE (FUEL SYSTEM)
Pricing for 960 AIR FLAP ACTUATOR SOLENOID (CABIN FANS & RELATED)
Pricing for 960 FUEL PUMP CHECK VALVE (FUEL SYSTEM)
Pricing for S90 AIR FLAP ACTUATOR SOLENOID (CABIN FANS & RELATED)
Pricing for V90 AIR FLAP ACTUATOR SOLENOID (CABIN FANS & RELATED)

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