Will not stay running, possible fuel pump issue

Hi,

When you jump the relay, will the vehicle continue running? If so and you checked the relay, we need to go backward to the main relay in the under-hood fuse block.

I attached the schematic below showing how power goes from the main relay to the fuel pump relay. Check to make sure it is good as well as the engine CNTL 3 fuse in the under-hood box. When checking the fuse, also make sure there is power to and from it. Here are two links you may find helpful when testing the fuses and the relay:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Let me know what you find or if you have questions.

Take care,

Joe

See pics below.

Hi,

It could be a couple of things. Next, we need to confirm the fuel pressure is within the manufacturer's specs. Here is a link that explains how it's done:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If you look at the attachment, it provides the manufacturer's fuel pressure specifications.

The reason I'm suggesting this is because it starts and then stalls. The pressure may build enough to first start the engine but be unable to maintain it.

Let me know what you find. Also, if you don't have a fuel pressure gauge, most parts stores will lend one to you.

Take care,

Joe

See pic below.

Hi,

Anything is possible but chances are that isn't the issue. I suspect it is a fuel pressure issue.

Are you comfortable testing the pressure using the link I provided?

Let me know.

Joe

Hi,

If the regulator is bad, chances are the pressure would be high. However, if a fuel injector is leaking, it will lower pressure. Do me a favor. Try starting it and then shortly after, remove one spark plug at a time to see if any are wet.

Also, when you check fuel pressure, did it drop off quickly when the key was released?

Let me know. Also, record it cranking and upload it so I can hear it.

Take care,

Joe

If it drops off that quick, there is a leak. If there is no evidence of a fuel leak that can be seen or smelled, the injector or injectors are likely leaking.

Sorry about that. I forgot the intake needs to be removed. Also, I had an afterthought. If you remove the fuel pressure regulator vacuum hose and turn the key on, does any fuel come out of the vacuum connector location on the regulator?

I attached all the diagnostics below for fuel-related issues. Take a look through them and see if there is anything you feel may help. Based on what you told me, there has to be a leak at some point. Otherwise, it would hold pressure for at least five minutes before starting to drop.

Let me know.

Joe

See pics below.

You should be able to make the video using a cellphone and then upload it to your computer or send it from your phone. I'm not the greatest with phones, but I know it can be done.

Let me know if you can figure it out and I will see what I can find.

Joe

Hi,

Is it starting now and continuing to run? Let me know.

Joe

Hi,

I need you to recheck for an RPM signal when cranking. When you first turn the key on, the fuel pump primes. When cranking, if there is no crankshaft signal, the PCM will not turn the fuel pump back on.

Let me know.

Joe