1999 Honda CR-V will not start. I changed the fuel pump, fuel pressure regulator along with the fuel filter and the main relay but the vehicle still will not start. The distributor along with the coil was replaced about two months ago, spark is ok. Sometimes the vehicle start for a few second but the engine stalls as if the timming is off but the timing is ok, also sometimes it back fires and when it does the vacuum hose that is connected to the fuel pressure regulator comes off from the regulator. I check the injectors and they are getting power. I disconnected the exhaust thinking of the catalytic but still no start. Could it be the computer? Any help on this matter will be greatly appreciated. Thanks

The fuel pumps the fuel into the engine from the tank. If you can hear it running , then you need to hook up a pressure gauge to see how muck pressure you have. If you have enough pressure then check the injectors to see if they are getting current from the computer to inject the fuel to the cylinders.

Fuel pump relay ? Have you checked base fuel pressure to find out if it is below spec ?

All vehicles have an emergency cutoff switch. But did you check the fuel rail to see if it has gas under pressure when the key is turned on? When you turn the key on can you hear the fuel pump kick in with a slight hum for 2 or 3 seconds? Did you check the main relay for the fuel pump to make sure that it was good before you changed the fuel pump? How about the fuel pressure regulator? ARE YOU GETTING FUEL? Are you getting spark?

problem 100% is the pgmfi main relay . its up under drivers side lower dash,its a very common issue with Honda/Acura vehicles. Its dealership only part,inexpensive,fairly easy for a person even with minimal auto experience can do.let me know if you need picture of for you k

Could be a fuel regulator also. I would start by checking the fuel pressure with a specialized gauge. The range varies for every auto depending on where you hook up guage you will have some pressure loss, but it should be only a few pounds. I would check for power at the pump also, should be battery voltage. The relay is easy to check, just swap out the relay with one door another one that matches, like for the fan or Windows etc. Look for an embossed number on the relay, to make sure. Make sure to put it back. And replace if that fixes the issue. There's may be a code that could set the dash light on. It may also have residual codes that don't set off the light. An injector issue should ping a specific cylinder with a code. The fuel pump would cause all cylinders to set off codes.

I’m happy to help further over the phone at https://www.6ya.com/expert/paul_0efc97cca45309c1

If you changed the fuel pump and the fuel filter and ignitor and regulator,in the list of changes do you know you have a EFI. The EFI main relay turn on the fuel pump which includes the circuit opening relay. Testing it mainly passes with flying colors just replace

CHECK FUEL PUMP RELAY AND FUSE.IF ALL IS GOOD FUEL PUMP MORE LIKELY FAILING.

Replace the main relay. They run hot and with hot internal temps of the vehicle, they fail until they are cooled down. Opening the door or windows allows the hot air to evacuate, this in turn cools the inside of the car (and relay), then the car starts.

replace the relay and fuel filter first

fuel pump location and access panel
under the back seat swab

Check your cold start injector, sit on top of intake.