[ghostrider1061]

i need a wiring diagram of the gas gauge system on a 87 astro van. mine quit working awhile back and i need to know the routing so i know what to repair or replace. i have tried using jumper cables from the gas tank to the ground post of my batt to no avale. :screaming: :screaming:

 

[astro355]

Have you checked the sending unit for the fault?

 

[ghostrider1061]

my gauge quit working when i replaced the fuel pump. the helper that i had actted like he knew what was going on. mabe my sender is bad, but if it ain't then i would like back up or plan b.

 

[webcat]

should be 3 wires from the fuel pump
1 grey----- fuel pump power
2 purple ---sending unit wire
3 black-- --ground

 

[astro355]

I hate to tell you this but if it were my van, I would drop the tank to make sure that the reinstallation was correct and that the floater isn't damaged. But anyways, there is three wires; black, gray and purple. Forever me yet again if I get these wrong but:

black=ground
purple=fuel pump positive
gray=fuel gauge sender

But in case of being wrong on the colors, whatever wire runs to the floater sending unit is for the fuel gauge.

 

[ghostrider1061]

ok thanks for the info. but what if it is deeper and i want to wire up a different gauge? i.e. auto-meter or such.

 

[Matrixx]

Hmm

Grey - Fuel Pump (12 volts)
Purple - Sending Unit (6volts)
Black - Ground

 

[astro355]

I really hate that, I always get those colors switched around. You would know it if you pull the sending unit out of the tank, you would figure. If you switch to an autometer or such, you would use the signal wire for the sending unit, which would be PURPLE. :shock: But what you have to realize is that the fuel gauge is only as good as the signal its getting so if something is wrong if the signal, floater or sending unit, replacing your stock gauge will NOT fix your problem.

Again, I think you may have to drop the tank and reexamine the sending unit.