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Q: Car won't start. What do I need to do? Car was running fine before I changed filter. on 1992 Mercury Capri

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Changed Fuel Filter. Car was running fine before changing filter. Checked Relay switch. It is in the correct position. Can hear the pump turn on when I try to crank the car. The car just won't crank.
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No crank cannot be affected by fuel pressure or changing the fuel filter.

If there is no crank, you have a battery that is low in charge, a starter that is drawing too much amperage, faulty connections with battery cabling, a starter relay issue, or an ignition switch issue.
I should explain this different. It doesnt run. It does try to turn over. It isn't the battery (checked). I do still have to change the spark plug wires. 2 of them are burnt. But that shouldn't stop it from running. I did some research. I am thinking it may be the fuel pressure regulator. What do you think?
It should not keep the car from running, indeed.

Can you tell if you are getting fuel? If you are getting spark? Seems odd that the problem would occur just after fuel filter replacement.

Is there any (remote) chance that the fuel filter may have been installed backwards by accident?
I should explain this different. It doesnt run. It does try to turn over. It isn't the battery (checked). I do still have to change the spark plug wires. 2 of them are burnt. But that shouldn't stop it from running. I did some research. I am thinking it may be the fuel pressure regulator. What do you think?
i changed my fuel pump and car didn't start. It cranked but wasn't getting gas. Had to relieve the fuel pressure to change the fuel pump. so fuel rail was emptied. Fuel pump was working fine, but, gas was not reaching the engine. I stuck a pin in the fuel relief valve until fuel reenterd the engine, and then it started fine. Make sure gas is reaching engine, check fuel relief valve
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