Fuel Modulator
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Tuned
Joined: Aug 2009
Posts: 274
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From: British Columbia
Fuel Modulator
I have been looking online at an 89 f-250 4x4 with an inline 6. The owner says it doesn't run because it needs a new fuel modulator. I have no idea what he's talking about. Can anybody shed some light on what a fuel modulator is and where it's at?
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Tuned
Joined: Aug 2009
Posts: 274
Likes: 4
From: British Columbia
I talked to the guy, he said they ran out of gas on one tank, when it quit they just kept trying to start it and that burned out the modulator.
None of it makes much sense to me. He says the truck won't start now with gas in either tank.
None of it makes much sense to me. He says the truck won't start now with gas in either tank.
Senior User
Joined: Feb 2012
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Sounds to me like the intank lift pumps aren't working , the 1989 uses 3 pumps , one in each tank and a high pressure pump on the chassis .
I would check for fuel pressure on the injector rail it should be near the number 1-2 cylinder on the passenger side of the engine . It looks like a valve on a tire to add air .
I would check for fuel pressure on the injector rail it should be near the number 1-2 cylinder on the passenger side of the engine . It looks like a valve on a tire to add air .
Postmaster
Joined: Aug 2005
Posts: 4,728
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From: Cleveland, TN
I'm not sure what a fuel modulator might be, we have a fuel delivery module in each tank that contains the pump, gauge sending unit, and check valves.
There is also fuel pressure regulator on the fuel rail on the engine..
I would forget anything the previous owner told you and just check for DTC codes and see what the truck wants fixed... go here and see how to do this.
Fuel Injection Technical Library » How To Run a Self-Test
If you don't want to count flashes here is a very good code reader for the OBDI trucks.
There is also fuel pressure regulator on the fuel rail on the engine..
I would forget anything the previous owner told you and just check for DTC codes and see what the truck wants fixed... go here and see how to do this.
Fuel Injection Technical Library » How To Run a Self-Test
If you don't want to count flashes here is a very good code reader for the OBDI trucks.
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