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Cadillac Repair/89 Cadillac Sedan De Ville fuel problem

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Expert: - 11/11/2010


Question
We have had this car in storage for over 3 years. Gas is old and can't get siphon into tank to empty because of siphon block. Can you help? Want to get it running? Has about 1/2 tank? Can we add high octane gas to car? Got any suggestions?
thanks, Adrienne

Answer
Hello,

Unfortunately, this fine unleaded gas with its EPA standards has probably turned to varnich and has no ignion qualities left.

The right wAy of doing this without plugging the fuel injector rails is to drop the tank, disgard the old gas and install a new electric fuel pump. Tank should be boiled out at a radiator store or parts store before changing pump. Fuel filter must be replaced and lines blown out.

You might think this is too expensive, but it is cheaper than replacing the injection system.

DO NOT USE starter fluid on this aluminum engine!!!



Good luck!

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Rob Painter

Expertise

Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?

Experience

Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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