Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
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If the terminal fit to the relay is loose meaning loose contact between the terminals and relay this will cause heat on the terminals and melt or damage the relays causing this here.This is one of the most common causes for relay burning up or failure with the terminals for the relays needing replaced.If this has not been checked this should be done to see if this is the cause here.If this was already checked and found o.k. let me know.
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The initial problem is usually caused by a fuel pump drawing to many amps.This heats up and damages the relay.So since the pump was replaced already and all wiring is o.k. if the pins are loose they will need tightened or replaced to correct this here and then the relay replaced again and should be good to go from there.I have seen this quite a few times before in the past.
Let me know if you need anything else and feel free to rate my help here.
My info isnt showing me on this model here how this is removed and replaced unfortunately.On some models the entire fuse panel needs replaced.You can contact a GM dealers parts department and they can look it up in their computer to see if any of the terminals are serviced seperately in the fuse panel or if the entire panel needs replaced.
The alcohol shouldnt cause the pump to draw to many amps as the pump would operate normally with alcohol in the tank.It is recommended though to use the proper fuel for this model here.
O.k. let me know how this turns out here and if you need anything else.