96 buick lesabre no power at pump

[turbo_5711]

o i had fuel tank cleaning as required because car was cutting out so i took tank down emptied it cleaned it and put it back together pump ran no pressure so i took  pump out replaced it with new one now no power to pump i have checked relays replaced htem all and fuses i am getting a direst drew of battery it sparks when i put  neg cable back on and it is draining the battery so can some of you help me figure this out please 

[turbo_5711]

i guess no one wants to help 

 

[MCHinson]

turbo_5711,

 

Welcome to the AACA Discussion Forum. I just happened across your recent post. I have moved your post from the AACA Technical Forum to the Buick General Forum. Your car is too new for AACA, so it is unlikely that you would find an answer in that forum. Perhaps someone who frequents the Buick Forum might be able to help. 

 

I don't have any experience with 96 Buicks but have had some slightly older Buicks in the past. Do you have a factory service manual for your car? Cars of that era are best diagnosed by following the troubleshooting charts in the service manual.

[EmTee]

Sounds like a short circuit to me -- bad pump motor (armature locked)?  Don't say "but it's new..." that makes no difference nowadays.  Disconnect the wire to the tank and see whether the spark disappears.

[60FlatTop]

You need the specific information for the sequence of operation on that car. My '86 gets a 3 second power signal to the pump when the key is turned on. That's all. Then the pump relay control is taken over by the ECM. I have a 6" thick factory binder for my car, an OTC 2000, and an OTC4000 diagnostic interface for mine. 50+ years of experience on a 120 year range of cars. And it is still a big PIA every time I have to figure something out.

 

Yours is at the beginning of the OBD II cars. A group like this https://www.a-body.net/forums/forum.php?s=671910a6a6058ee9a98ae01420b9220b

Is going to be more help.

Bernie

[NTX5467]

As I recall, on the GM fuel injection systems, there is a timer for the fuel pump.  If the engine doesn't start within a certain amount of seconds (seems like it used to be about 45 seconds, back "when") after the key is "ON", the pump turns off.  There is another part of the fuel pump supply electricity and that is the oil pressure sending unit.  Same thing, if oil pressure isn't present, the pump electricity is killed.

 

As the computer is always "live", as is the clock in the radio OR an alarm system, you have to look at the amount of any "draws" with the ignition key turned "OFF".  On the then-new '84 Corvettes, the dealers got a letter instructing them to charge the battery for 24 hours when the cars came off the transport trucks, to ensure the batteries were fully charged "on the lot".  Also to charge the battery every so often, if the car was not run.  Reason?  Some of our customers discovered that their new Corvette, in a locked garage for more than 30 days would have a dead battery.  Why?  The parasitic draw from the factory alarm system!  ALL esplain'd in factory TSBs for "Dead battery".

 

About all you might do is troubleshoot the circuit with a test light and meter.  Let us know what you find.

 

Welcome to the Buick side of the AACA-hosted forums!  One of the most active forums which they host.

 

NTX5467