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When I got my 86 it had sat for 3 years and I had the same pump problem and it turned out to be a seized pump, check for ground and 12 volt power at the connector, you should only have 12 volt with the engine cranking because the ground for the relay is controlled through the air flow meter, the 86's infact do not have a drainplug on the tank and are a real pain to siphon but make sure you soak everything down real good with a good penatrating fluid and let it soak in first(very important)while its doing that disconnect your wiring from up top, both connectors one is for the sending unit and one is for the pump, then remove all the lower plastic panels being careful because those bolts like to break, once the panels are removed remove the plastic cover on the firewall that covers the fuel vapor seperator(its the big plastic cover right down the middle of the firewall, there is one 10mm nut at the top and 1 or 2 at the bottom) then disconnect the fuel filler and vent hoses from the tank accesible from the engine compartment from underneath and yes they are a bitch and I've never found an easy way to do them, once that is done remove the brake bracket and gently place it at the back of the car and again be careful with the bolts as they seize and break, once that is done remove the two nuts on the straps while holding the tank, you might want to get someone to help you and lower the tank down front end first and slide forward. Now if your tank has the same problem mine had where its really rusty inside what I did was plugged up all the holes except the filler hole and laid the tank on its end opposite of the filler and poured in 3 gallons of a light duty acid like muratic and filled the rest with scalding hot water and leave it sit for 24 hours then poured out the mixture and pressure washed the tank then poured in a few liters of gasline antifreeze and swished it around and drained that then put in about a liter of motor oil and worked it all over the inside of the tank and dumped it out then put a new pump in and installed the tank and filled it to the brim with gas and a couple bottles of gas line antifreeze. Also if you do end up having to drop the tank drill a small hole through the pump base top and run new wires for the fuel pump, ground and positive and seal the hole with some gas resistant epoxy, I've done a few pumps on twos where I've had to drop the tank a week later to fix wiring so I just do it to everyone I do now
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