Is vapor lock related to fuel pump problem? - 1999 Ford Escort

Vapor lock is caused by fuel getting too hot in a fuel line or fuel rail and is rare since modern fuel system circulate fuel fro the tank to the fuel rails and then excess goes back to the tank. Are you sure you have vapor lock? Please describe all symptoms.

Vapor lock can be caused by many different things, all coming down to the same root cause: too much heat in the fuel feed lines.

Low fuel pressure can cause the amount of heat needed to vapor lock to be lower than normal, so checking fuel pressure is important. Fuel pump going out feels a lot like vapor lock.

Engine overheat can also cause vapor lock. Clogged fuel filter can cause vapor lock. The fuel line should be routed away from the exhaust system.

Vapor lock is something for carberated cars. Modern fuel injected cars have fuel pump in the tank and the whole fuel system is pressurized.

Why do you think you have vapor lock?

You need a different mechanic. Vapor locks stopped in the 60's.

maybe what you have is not vapour lock as such but a vacuum forming in the tank and not allowing the fuel to be pumped to the injectors. I would be checking the canister and canister controls to ensure adequate venting. I f the fuel tank has been continuously filled to the filler neck then fuel can contaminate the canister and not allow it to work properly. In short I would be looking for reasons in that area Run fault code check and see if any fuel related problems are presented.

To promote easy starting, all gasolines contain volatile constituents that under some conditions, such as high ambient temperature, tend to produce more vapor than the fuel-system vents can handle. The action of an engine-mounted fuel pump, in decreasing the pressure at its inlet, tends to vaporize the fuel. If the vapor forms faster than the pump can draw it from the fuel line, the flow of fuel to a carburetor is effectively stopped and the engine stalls. Vapor lock is much less likely on a fuel-injected engine with an electric pump in the fuel tank. However, an engine with port fuel injection may experience vapor lock if the injector or fuel overheats, or if the Reid vapor pressure of the fuel is too high.

Read more: http://www.answers.com/topic/vapor-lock-1#ixzz2Pf13O7aL

Vapor lock is when a fluid in a closed system, such as in a hydrolic system, gets get hot enough to boil and produce vapor which unlike a fluid can be cimpressed thus rendering hydrolic systems inoperative. Fluids act as a solid when pressure is exerted on to them but in their gaseous state (vapor) they can be compressed and the pressure needed to move pistons is instead absorbed by the gas rather than applied to the pistons.

Fuel Pump Module —Vehicles with Returnless Fuel System Removal
WARNING: Do not smoke or carry lighted tobacco or open flame of any type when working on or near any fuel related components. Highly flammable vapors are always present and may ignite. Failure to follow these instructions may result in personal injury.

1. Remove the fuel tank.

1. Using the special tool, remove the fuel pump locking ring.

Remove the fuel pump module.
• Rotate the pump counterclockwise to remove.

1. Remove and discard the O-ring seal.
Installation
WARNING: Do not smoke or carry lighted tobacco or open flame of any type when working on or near any fuel related components. Highly flammable vapors are always present and may ignite. Failure to follow these instructions may result in personal injury.

1. Install a new O-ring seal and locking ring.

Fuel Pump Module —Vehicles with Returnless Fuel System
Special Tool(s) Wrench, Sender Unit, Fuel Tank
310-065A (23-054) Removal
WARNING: Do not smoke or carry lighted tobacco or open flame of any type when working on or near any fuel related components. Highly flammable vapors are always present and may ignite. Failure to follow these instructions may result in personal injury.

1. Remove the fuel tank.

1. Using the special tool, remove the fuel pump locking ring.

1. Remove the fuel pump module.
   • Rotate the pump counterclockwise to remove.

1. Remove and discard the O-ring seal.

Installation
WARNING: Do not smoke or carry lighted tobacco or open flame of any type when working on or near any fuel related components. Highly flammable vapors are always present and may ignite. Failure to follow these instructions may result in personal injury.

1. Install a new O-ring seal and locking ring.

1. To install, reverse the removal procedure.

Actually vapor lock refers to a condition in the intake manifold on a carbureted engine. You don't have vapor lock. What you may have is a filter inside the tank, its nicknamed a sock. Its a fine mesh screen and may be plugging up. When you pull the fuel line the fuel flows back and unblocks a small section , until it starts too **** again and re plugs. You may also have fuel pump that starts to lose power when its gets hot. Lee