MY 1990 FORD THUNDERBIRD 6 cylinder , shuts off ( only) when i put it in reverse! can you help?thank you

google 2002 Ford Thunderbird fuel filter location



https://www.justanswer.com/ford/10q07-fuel-filter-located-2002-ford-thunderbird-thank-you.html

yes (1st question only), but there's an alternate here:
REPLACE THE FUEL PUMP IN THUNDERBIRD

What happens if you give it a little gas ? Hold the RPM's up , will it keep running then ? How does it Idle , smooth or ruff ? Does the idle seam low ?

4.5 quarts with filter change. Run engine until it warms a bit and the oil pressure indicates a readout. Let it set a while and recheck the level .

Dear Fuel Pump Locator.....
The fuel pump for your tbird is located inside the fuel tank of the vehicle....as well as the sending unit for the fuel .Yes it is a bear to get down on the ground...especially without a car hoist.The starter solenoid should be on the LF inner febder under neath the hood of the vehicle...I HPE I HELPED!!

glad you wrote. You have the same problem that all older vehicles have with ethanol gas. Here's what you do. first, by 2 fuel filters for your truck(you seem to have a bad case). when you take it off, you'll see what looks like bad gas. it is; it's what ethanol does to the fuel and the fuel systems, the emissions, and the engine. on small engines(boat, mowers,etc.) it burns them up.<p>
Change the filter, add a can of SEAFOAM to at least 1/2 tank(s) of PREMIUM gas. run it on idle for about 5 minutes. then drive it at least 50 miles before changing out the fuel filter again.<p>
ethanol is like corn liquor, it puts water in the fuel, and turns the gas to a goopy substance. be glad you haven't burnt up the fuel pump(s).<p>
add SEAFOAM every 3000 miles to your tank(s) and it will make it run great. it will clean up the valves, the egr valve, the fuel lines, and the sediment in the pump. and it will clean the injectors.<p>
I think you caught it in time. let's hope so. good luck.

Check fuel pressure after replacing filter. Fuel pump may be going bad.

check you fuel pump relay or your fuel pump shut off switch

In the trunk left side is inertia switch.  rap ******* side with fist, causing button to pop up on top, when this happens the fuel pump will no longer receive power.  Now try to start vehicle, should attempt to start and die.  Fuel system is no de pressurized.  PLease be careful as there is still some pressure in system! and remember to reset inertia switch when done by pressing pop up button back to the down position.

check to see if you have a flapper valve that operates your feul injection if you do you might have to replace it.