trunk fuel pump relay

flowerse123

Registered User
90 Super Coupe Automatic shift. Now The relay is not sending voltage to the pump, other 3 wires are hot. The question is a bad relay? Or not getting the right signal from EECM? All info is greatly appreciated, thanks. It sure would be nice to see this bird fly again
 
You probably already know this but incase you don't the pink stripe wire is the power wire going from relay to pump and sadly that's really the only thing I know about that circuit I'm unfortunately not sure which wire is incoming voltage so I'm not alot of help
 
In your post June 13th you had 12 volts to the relay & the IRCM was able to control the relay, but you only had 10 or 11 volts at the pump. You were going to check the harness from the relay to the pump & the relay itself because, even though it was turning on it may have high resistence internally. Guessing you didn't persue that or have done more damage to the relay/harness.
 
In your post June 13th you had 12 volts to the relay & the IRCM was able to control the relay, but you only had 10 or 11 volts at the pump. You were going to check the harness from the relay to the pump & the relay itself because, even though it was turning on it may have high resistence internally. Guessing you didn't persue that or have done more damage to the relay/harness.
yes, The problem changed, for better or worse I am not sure but still hopeful.. The two wires for the fuel, guauge are bot hot as well the larger black wire that brings in the voltage for the pump is hot. the relay is not passing voltage
You probably already know this but incase you don't the pink stripe wire is the power wire going from relay to pump and sadly that's really the only thing I know about that circuit I'm unfortunately not sure which wire is incoming voltage so I'm not alot of help
Yeah, its two larger wires for the pump and two smaller wires for the guage, thanks
 
yes, The problem changed, for better or worse I am not sure but still hopeful.. The two wires for the fuel, guauge are bot hot as well the larger black wire that brings in the voltage for the pump is hot. the relay is not passing voltage

Yeah, its two larger wires for the pump and two smaller wires for the guage, thanks
It's possible that the relay was starting to fail, which was why you had 12.5 volts going to it & only 10-11 at pump & now the relay has failed completely. It or the harness must be shorted to ground if the wires are getting hot(heavy current draw). I wouldn't be turning ignition on again until you find out what is shorted, as you'll be causing more damage or something catching on fire, although the fuse's/breakers at front should open before that happens. Maybe the pump is seized or shorted internally & that was drawing the voltage down? Sounds like the relay has failed now, but thats the result of other issues, not the original problem. You'll need to find & fix that before replacing the relay or you'll just burn it up too.
 
It's possible that the relay was starting to fail, which was why you had 12.5 volts going to it & only 10-11 at pump & now the relay has failed completely. It or the harness must be shorted to ground if the wires are getting hot(heavy current draw). I wouldn't be turning ignition on again until you find out what is shorted, as you'll be causing more damage or something catching on fire, although the fuse's/breakers at front should open before that happens. Maybe the pump is seized or shorted internally & that was drawing the voltage down? Sounds like the relay has failed now, but thats the result of other issues, not the original problem. You'll need to find & fix that before replacing the relay or you'll just burn it up too.
Thank you very much for that info. I will print that out and do like you said. Thanks again...
 
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