Hi, I have a1987 f 150 302 cu in with aod trans ,dual fuel tanks. 110k miles. I purchased it used and at first noticed it would shut off while driving sometimes being fine for 50 miles at other times it barely left the driveway. it would start back up usually after setting a couple of minutes, idle okay but bucking and stumbling , sometimes doing this for 10 mins. I replaced the ign module with a wells unit purchased at autozone. it seemed okay for awhile...... then started doing it again....Now a new problem.... the pumps will not energize after turning the key to the"on" position ( won't start), i repl the fuel pump relay and still no buzzing, no fuel pressure at the shrader valve..... the engine will run if you squirt fuel into throttle body.........HELP!
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Re: no fuel pressure/shutting off
Try putting a new fuel pump in it or check the fuel tank switching unit it might have failed. (switch or unit under truck).I would go under truck and try to isolate one tank both electricaly and mechanicaly the see how it runs.
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If the fuel pump(s) run while the pressure is falling, replace the fuel pressure regulator and (although I'm sure you've already done this), replace the fuel filter. If the fuel pumps appear to be turning off by themselves, replace the inertia (fuel cutoff) switch.
you probable skipped you're 90.000 major service point 30.000 60.000 90.000 platinum plugs are gone at 100.000 , ready...get you're wallet out.. trans filter service. Flush change all fluids ..brake coolant etc.... rear brakes are done unless replaced..check all brakes..plug wires drive axle fluid. Thermostat... cheep part very impotant. timing belt if it has one .. if it brakes it could smash valves or shut you down..when you do timing belt better do water pump it is usauly driven by timing belt and check all belt drive pullys
look for shaking of the fuel line at the carburetor . If it shakes while moving it could causing a vapor lock. also, when it stall , you might have to check the fuel delivery at the carb. open the connector and see if fuel is being delivered, when it stalls. . This is very dangerous. so be careful , because today's gas is explosive, not only flammable.
Did you have the fuel pump pressure tested./ A local parts store can probably give you the psi it should have when cranking the engine. I used to use a clear gas filter before the carb. and when mine stalled, I quickly jumped to see if there was fuel in it. And last but not least least, does it stall on one tank or on both tanks.?
You'll have to do some investigating to find out. First, is it a lack of spark to the plugs, or fuel to the injectors ? Then, is it something getting hot like a relay or the coil, or something like a build up of pressure in the gas tank.
Fueling it should have nothing to do with the engine light. I feel the reason the nozzle shuts off is because when you fill your tank there has to be a certain amount of air release from the tank while filling. You may have no air release causing air pressure. This air pressure will shut off the nozzle. There should be an air release line hooked to your tank I feel.
nap Z engine is a venerable work horse using dual ignition design but wont get much better mileage than you are experiencing now ... try larger tires..more air pressure. premium fuel every 10th tank full (unocal 76 , 91 octane).....free flowing air filter (K&N ) hotter spark plugs ..indexed prefereably...timing advanced slightly..tailgate down or install topper or tonneau bed cover... check jet chips or other co. for performance computer upgrade...good luck