No fuel pressure after fuel pump swap

Hi,

When the key is turned "on" with out the engine running, the control module turns a fuel pump relay "on" for two seconds. If that relay doesn't energize the pump to prime, a delayed start or even a no start can occur. Lets start by testing the relay. The fuel pump relay is under the hood in the fuse/relay box. I attached a pic to help locate the correct relay. If there is another relay with the same part number, switch them and see if that makes a difference. Or, here is a link explaining how to test a relay:

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

My biggest concern is that the relay is working when the engine is running. This may be related to the control module, but lets start with the easiest fix first. Also, I will need to know if the oil pressure switch is working.

Let me know what you find.

Joe

Let me know what you find. The interesting thing is that it runs once you prime it. Have you tried checking for diagnostic trouble codes? Also, if possible, can you check for spark to the plugs when it fails to start? Also, does the oil pressure gauge work?

Hi,

It's in the under hood fuse box. See the two attached pics. Note that the numbers in pic 1 are looking at the box from the rear. The second pic shows the actual fuse location.