| View previous topic :: View next topic |
| Author |
Message |
stan_5150
Joined: 01 Sep 2006
Posts: 31
Location: Minnesota
|
 Posted: Thu Sep 23, 2021 11:15 pm Post subject: fuel pump relay jumper 30/87 tutorial? |
 |
|
Is there a link or photo tutorial on how to properly jumper the fuel pump relay 30 to 87? Thanks in advance.
_________________
1978 924 N/A |
|
| Back to top |
|
 |
chuck21401
Joined: 20 Feb 2005
Posts: 606
Location: Annapolis, MD
|
| Posted: Mon Oct 04, 2021 11:10 am Post subject: Re: fuel pump relay jumper 30/87 tutorial? |
|
|
| stan_5150 wrote: | | Is there a link or photo tutorial on how to properly jumper the fuel pump relay 30 to 87? Thanks in advance. |
There are a number of threads on this board about how to jump the fuel pump relay. If you search "jumper" you'll find plenty to read about.
I think the guidance in this area depends on your situation. If you are trying to start a car that has not been run in a long time, you may want to pull the injectors and have them flow into glass jars or risk contaminating your oil with fuel. If you are trying to determine if your FPR is a problem and use jumper for a 1/2 second that's a bit different.
I made one of these today. I recommend using thick enough wire and of course decent connectors. I crimped the wires and used marine heat shrink tubing. Probably overkill but the marine stuff includes adhesive lining so it will never go anywhere.
The second picture shows the jumper from 30 to 87. In the picture the relay is not oriented with the housing; instead it is positioned to illustrate the numbers on the bottom of the relay. Check where you a plugging the jumper wire three times.
Power for the relay comes from the battery via the red/blue wire...then the jumper then...the red/black wire. But double check the current flow diagrams. Jump the wrong wires and things get toasty quick!
This jumper wire I made is just under 4" long.
In my case I wanted to make sure the fuel pump was getting power. I plugged in the jumper wire...then connected the battery briefly to hear the fuel pump run.
Flaky connections might seem to indicate a bad fuel pump relay. Make sure the ground is definitely connected. A fuel pump relay that is not all the way plugged in might not work correctly.
With turbos, the overboost switch serves as the ground. A bad switch will not ground....so the car will not run.
YMMV. Good luck.
_________________
1981 Porsche 931 w/S1 engine & euro g31 transaxle. Water-cooled intercooler |
|
| Back to top |
|
|
stan_5150
Joined: 01 Sep 2006
Posts: 31
Location: Minnesota
|
| Posted: Mon Oct 04, 2021 10:42 pm Post subject: |
|
|
Chuck,
I figured out how to create and install the jumper. I could hear the fuel pump running as soon as the connection was made.
Interesting thing is that the start process sounded the same with both the relay installed, or if I had the jumper installed. I got the car to fire and run with the relay installed.
Thanks again!
_________________
1978 924 N/A |
|
| Back to top |
|
|
|
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
924 FAQ (Technical)
