Fuel pump bypass Switches - ZR-1 Net Registry Forums

scottfab · 08-26-2012

So over the years I've experienced several fuel related issues mostly related to fuel pumps. Each time getting at the test pig tail for energizing the pumps to test them has been a pain.

Recently I had reason to believe I again had pressure problems and had to find the test pig tail and apply 12v to measure the pressure.
Well this time I installed a switch. No change that. I installed two switches to help with this issue.(turns out fuel was not the issue but now I have two helpful switches)

The first switch is wired between 12V and the "test pig tail" near the ECM.
The second actually goes from the FP2 fuse on the Auxiliary fuse box to a 12v source that is active with the ignition key. This second switch was an idea I had last year when the primary fuel pump stopped working. What I wanted to be able to do was kick in the secondary fuel pump to be able to drive home. Instead I had to get a flatbed out there and have it towed. How embarrassing.

Here is were I added the connector into the test pig tail.
http://zr1.net/forum/album.php?album...pictureid=1444

Here is the switch that goes to the "test pig tail":
http://zr1.net/forum/album.php?album...pictureid=1443

Here is the emergency bypass for the secondary fuel pump should the primary fail. (sorry the image is BIG. You have to scroll over to the right to see the switch and it's label)
http://zr1.net/forum/album.php?album...pictureid=1442

Now when/if the primary fuel pump fails I can reach over into the passenger side and pull the switch on.
I chose a pull type switch to keep accidental enabling from happening.

I noticed that I did not post a pic of the change I made on the schematic. Here it is. Note it is in the Section 8A manual as is shown by the page number.
[IMG]

[/IMG]

08-26-2012	#1
scottfab Join Date: Jan 2009 Location: Portland Oregon metro area (Washington side) Posts: 3,207	Fuel pump bypass Switches So over the years I've experienced several fuel related issues mostly related to fuel pumps. Each time getting at the test pig tail for energizing the pumps to test them has been a pain. Recently I had reason to believe I again had pressure problems and had to find the test pig tail and apply 12v to measure the pressure. Well this time I installed a switch. No change that. I installed two switches to help with this issue.(turns out fuel was not the issue but now I have two helpful switches) The first switch is wired between 12V and the "test pig tail" near the ECM. The second actually goes from the FP2 fuse on the Auxiliary fuse box to a 12v source that is active with the ignition key. This second switch was an idea I had last year when the primary fuel pump stopped working. What I wanted to be able to do was kick in the secondary fuel pump to be able to drive home. Instead I had to get a flatbed out there and have it towed. How embarrassing. Here is were I added the connector into the test pig tail. http://zr1.net/forum/album.php?album...pictureid=1444 Here is the switch that goes to the "test pig tail": http://zr1.net/forum/album.php?album...pictureid=1443 Here is the emergency bypass for the secondary fuel pump should the primary fail. (sorry the image is BIG. You have to scroll over to the right to see the switch and it's label) http://zr1.net/forum/album.php?album...pictureid=1442 Now when/if the primary fuel pump fails I can reach over into the passenger side and pull the switch on. I chose a pull type switch to keep accidental enabling from happening. I noticed that I did not post a pic of the change I made on the schematic. Here it is. Note it is in the Section 8A manual as is shown by the page number. [IMG][/IMG] __________________ Scott Vett owner since 1979._It's about the car and the people Last edited by scottfab; 02-26-2014 at 07:05 PM.