How hard to change oil pump on mercury Capri.build date 09/93

The fuel pump assembly is located inside the fuel tank.

A fuel pump relay will not effect spark, and you can usually listen to the fuel pump to hear it kick in 1 sec before you crank the vehicle over. Are you sure you are not getting spark? How did you test for spark?

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need to aling timing marks for the camshaft to the marks on the valve cover marks and the dot on the cranshaft gear to the oil pump housing mark

What you really want to do is have a technician remove the oil sending unit and attach a pressure gauge of known reliability. Only then can you know if your pressure is good or bad.

If you have to change an oil pump, you can have problems reaching it. You may be able to find a Video or text online for your exact model. The Capri series covers a lot of Years and the engines may be different and one year may be a front wheel drive while an older one may be rear wheel drive.

One of the biggest problem is having clearance to remove the oil pan. Sometimes in the closest clearances turning the crankshaft can help make room to drop the oil pan.

Front wheel drive units can have a cradle which blocks pan removal. You need to find out the requirements for your exact year.

The pressure test will help diagnose other problems. Bad bearings can leak so much oil that pressure will behave exactly like you describe.

If stock radio it has build up in side and will need to be open and cleaned, if after market, one of the wires is not making full contact.

Clean the idle speed control valve and the throttle body of the engine and that should correct this.

as long as you oil pressure don't drop below 30 you should be good on an oil pump.. as far as your shifter, the pin or bolt may be getting ready to fall off... don't pull on it anymore until you get it repaired or you may get it stuck in drive and not be able to put it back in park.. that could be tragic.

Most likely is a clogged radiator. Next would be the pump fins rusting off, not allowing pumping. Both reasons would be because antifreeze was not run in the engine over the years, and rust could clog the radiator, and water would rust off the pump fins...I'm still betting on the radiator though...good luck...Chris

possible timing chain/belt has slipped a tooth

the turbo booster is filled with oil and if you have no oil pressure there is no boost