2nd Generation S-series (1995-2005) Tech Discuss 2nd generation S-series (1995-2005) general tech topics here.

Fuel pump and gauge

Thread Tools
 
Search this Thread
 
  #11  
Old 12-07-2023, 05:53 PM
supermo26's Avatar
New Member
Thread Starter
Join Date: Oct 2017
Posts: 9
supermo26 is on a distinguished road
Default

As key was turned, i got 20mV to one pin and 12V's to the other. (85 / 86 on the relay) if I left my wire and relay in and tested the ground signal to battery, the fuel prime worked.

12V constant on the supply side. Pump side was 0. (30 / 87).

Where in the fuse panel is the ground?

 
  #12  
Old 12-07-2023, 08:03 PM
GeorgeLG's Avatar
BF Veteran
Join Date: Jan 2007
Location: Florida
Posts: 4,050
GeorgeLG will become famous soon enough
Default

So now you know which pin between 85 and 86 is the ground side on the relay coil. Under that under hood fuse block a black wire exits the UHFB in one of the big cable bundles and makes its way to the G114 ground. There is most likely corrosion under the fuse block or a problem with the black ground wire. The problem with unbolting the fuse block to get a look under it is that it might be like pulling a thread on a sweater. The best bet if this is the only issue is to run a new ground wire if possible. Follow the G114 ground point back to the panel and open the cable bundle before it goes under the fuse block. Then find the black wires and probe them looking for continuity to the relay socket pin. Alternatively you can solder a wire to the relay pin and run that wire to ground. That last solution is not ideal but may get you going.

George
 
  #13  
Old 12-07-2023, 08:33 PM
supermo26's Avatar
New Member
Thread Starter
Join Date: Oct 2017
Posts: 9
supermo26 is on a distinguished road
Default

I had the fuse block apart a few days ago while troubleshooting. At the time I was thinking I'd hot wire an on off switch. Then I noticed other problems and held off.
Now I'm thinking of adding / beefing up the ground. Maybe tomorrow I can climb under a look for the ground at the back of the engine. George, Thank you for the help. I'll post what i find.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
El_Beautor
2nd Generation S-series (1995-2005) Tech
1
09-19-2012 12:49 PM
Chevy33
2nd Generation S-series (1995-2005) Tech
2
05-16-2011 11:51 AM
Toby Hanson
1st Generation S-series (1983-1994) Tech
11
09-10-2010 08:11 PM
mtr118
Engine & Transmission
2
07-09-2010 08:58 PM
rafa.jrbarajas
2nd Generation S-series (1995-2005) Tech
1
08-02-2009 02:08 PM



Quick Reply: Fuel pump and gauge



All times are GMT -5. The time now is 06:12 AM.