Walbro pump voltage requirements
Thread Starter
Instructor
Joined: Feb 2015
Posts: 234
Likes: 20
From: Stuart Florida
Walbro pump voltage requirements
I am installing a Walbro 180LPH fuel pump in my 1994. Supposedly its good for over 400rwhp, so I didn't go with the bigger pump. Anyway, I installed it and no pressure in fuel rail, no start. So I removed the pump, connected the power directly to the sending unit wiring harness and it ran fine, so I know connections are ok. I tested the connector outside the fuel filler and it measured 12.8V when I turned the key, then no power, down to 0 Volts.
Questions: 1. is 12.8 V enough for the 180LPH, or do I need the racetronix wiring kit? 2. Should the power go out after about 2 seconds?
When I have power and it runs outside the vehicle.
3. Why am I not getting pressure at the shraeder valve, and no start?
Questions: 1. is 12.8 V enough for the 180LPH, or do I need the racetronix wiring kit? 2. Should the power go out after about 2 seconds?
When I have power and it runs outside the vehicle.
3. Why am I not getting pressure at the shraeder valve, and no start?
Team Owner
Joined: Jul 2004
Posts: 28,422
Likes: 3,273
From: Hartford WI
Yes. The system is priming the fuel circuit and then shutoff.
Not sure. When you turn it on, is the pump getting charge or could the connector be somehow broken or bent?
Thread Starter
Instructor
Joined: Feb 2015
Posts: 234
Likes: 20
From: Stuart Florida
When I check the connector that is near the fuel filler cap, it jumps to 12.8V when the key is turned, then falls to zero in about two seconds. I'm leaving town tomorrow morning for a week. I will reinstall and make sure of all connections when I get back. I'm glad to hear that you
are using stock wiring, I was ready to get the Racetronix upgrade. Could this be the relay?
Team Owner
Joined: Jul 2004
Posts: 28,422
Likes: 3,273
From: Hartford WI
When I check the connector that is near the fuel filler cap, it jumps to 12.8V when the key is turned, then falls to zero in about two seconds. I'm leaving town tomorrow morning for a week. I will reinstall and make sure of all connections when I get back. I'm glad to hear that you
are using stock wiring, I was ready to get the Racetronix upgrade. Could this be the relay?
are using stock wiring, I was ready to get the Racetronix upgrade. Could this be the relay?
As to the upgrade, I wouldn't at this time. Not sure if it can be the relay since it was getting the signal to prime.
