95' Honda Civic 1.6 liter, will crank but wont stay running. Distributer, rotar, wires and plugs, fuel Filter and fuel pump have been replaced. We have been able to get the car running on occassions after replacing something and using carb/choke cleaner into the fuel intake. Once running the car runs great, this is why we do not suspect injectors. We call it a night and next day we go to start car, nothing! Will crank but won't catch. Not sure where the fuse for fuel pump is located. Not sure what else could be causing the problem. Please God help us soon, friend has been stuck here since Monday and it is Thursday now!!!

I have a 95 honda civic and it will crank but not start, ive heard they have a common fuel pump relay problem so i bought a new 1 and also a new fuel pump but yet still the car will not start. we i turn the key the fuel pump does not engage and am stumped. ive checked all the fuses but there all good. any ideas please help . thanks

The fuel pump could be working intermittently or the relay is not making proper contact internally on a regular basis. Check the following items in the fuel system:

FUEL SYSTEM Fuel Pump The fuel pump is an inline, direct-drive type. Fuel is drawn into the pump through a filter, flows around the armature through the one-way valve and is delivered to the engine compartment. A baffle is provided to prevent fuel pulsation. The fuel pump has a relief valve to prevent excessive pressure. It opens if there is a blockage in the discharge side. When the relief valve opens, fuel flows from the high pressure to the low pressure side. A check valve is provided to maintain fuel pressure in the line after the pump is stopped. This is to ease restarting. The pump section is composed of a rotor, rollers and pump spacer. When the rotor turns, the rollers turn and travel along the inner surface of the pump spacer by centrifugal force. The volume of the cavity enclosed by these three parts changes, drawing and pressurizing the fuel. Pressure Regulator The fuel pressure regulator maintains a constant fuel pressure to the injectors. The spring chamber of the pressure regulator is connected to the intake manifold to constantly maintain the fuel pressure at 36 psi (248 kPa) higher than the pressure in the manifold (40-47 psi or 280-330 kPa for 1992-95 models). When the difference between the fuel pressure and manifold pressure exceeds 36 psi (248 kPa) (or 40-47 psi / 280-330 kPa for 1992-95 models), the diaphragm is pushed upward, and the excess fuel is fed back into the fuel tank through the return line. Injector The injector is of the solenoid actuated constant stroke pintle type consisting of a solenoid, plunger, needle valve and housing. When current is applied to the solenoid coil, the valve lifts up and pressurized fuel fills the inside of the injector and is injected close to the intake valve. Because the needle valve lifts and the fuel pressure are constant, the injection quantity is determined by the length of time that the valve is open, i.e., the duration the current is supplied to the solenoid coil. The injector is sealed by an O-ring and seal ring at the top and bottom. These seals also reduce operating noise. Resistor The injector timing, which controls the opening and closing intervals, must be very accurate since it dictates the air/fuel mixture ratio. The injector must also be durable. For the best possible injector response, it is necessary to shorten the current rise time when voltage is applied to the injector coil. Therefore, the number of windings of the injector coil was reduced to lower the inductance in the coil. This, however, makes low resistance in the coil, allowing a large amount of current to flow through the coil. As a result, the amount of heat generated is high, which compromises the durability of the coil. Flow of current in the coil is therefore restricted by a resistor installed in series between the electric power source and the injector coil. Main Relay The main relay is a direct coupler type which contains the relays for the electronic control unit power supply and the fuel pump power supply. This relay is installed at the back of the fuse box.