Not getting fuel after engine swap?

Hi,

When you say it not getting fuel, are you referring to the fuel pump not supplying it, or the injectors aren't injecting?

I have a feeling you are referring to the pump since you replaced the relay. So, the circuit is really simple. The relay has a primary and secondary side.

When the key is placed in the run or start position, the primary side of the relay gets power from the powertrain control module which goes directly to ground. This causes an electromagnet in the relay to close a switch on the secondary side of the relay allowing power to reach the fuel pump. So, we first need to determine if there is a general power issue.

Take a look at this link. It explains how to check a relay in much better detail than I can put here. Keep in mind, I realize the relay is new. I need to make sure there is power and ground available.

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

So, I attached a pic below showing the power flow. My first suspect is that a ground for the primary side of the relay was left disconnected when the engine was changed. It is mounted to the left side of the engine.

If you look at the relay itself, it will have pin numbers. The primary side is 85 and 86. One will have power with the key on and the other is a constant ground. With the key off, check if one of the two connectors in the box has continuity to ground. If it does, then check the opposite pin (85 or 86) for power with the key on.

If that is good, then we need to check the secondary side. The ECM B fuse in the under-hood fuse box supplies power to the relay. Check the fuse first. If it is good, confirm there is power to and from it.

Here is a link you may find helpful:

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

If it is good, remove the relay. With the relay removed, either pin 87 or 30 should have power at all times, regardless of the key position.

If it does, then we need to check for power out via the opposite pin (30 or 87).

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

Take care,

Joe

See pics below. Note: The ECM B fuse is right next to the fuel pump relay. See pics 2 and 3.