Fuel pressure. 97 grand marquis.

Asked by Oct 03, 2016 at 09:25 PM about the 1997 Mercury Grand Marquis 4 Dr GS Sedan

Question type: Maintenance & Repair

New fuel pump. Fuel filter. An fuel pressure
regulator. Idles fine an runs good. As soon as you
smash it it just boggs out the fuel pressure off the
rail is low. No check engine lights.

7 Answers

1,275

You've done everything, assuming the pickup screen in the tank is clean, on the pump. Get a new gas cap. Try running it with just a rag in place of the cap. Maybe air can't get into the tank.

1,275

Also, replace the fuel pump relay, under hood. They go bad.

Well it runs when you cruise around. No issue 100mph. But as soon as you punch it it just boggs out an low fuel pressure

1,275

I still say replace that fuel pump relay.

1,275

I've got it. Replace or clean the MAF sensor by the air cleaner. Happened to me once, almost got rear-ended. You can buy spray cleaner and tamper-proff bit set at the auto store, or get an exchange unit for around $100.

Can a maf make the fuel pressure drop to 5psi?

1,275

Probably not, it regulates how much fuel is injected. How do you measure pressure while driving? I still say replace that relay and gas cap. Either one could do it, and they are cheap. The only stuff I could find on google is for turbocharged engines.

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