fuel filter light?
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Junior User
Joined: Aug 2007
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fuel filter light?
93 f350 turbo, when I switched tanks on the way home, the fuel filter light went on. If I switch it back, it goes off. Btw, I was on the freeway. I also show a little bit of white smoke all the time! Recently had return lines, fuel filter, and injectors changed, runs good though. Any ideas? Thanks!
Junior User
Joined: Jul 2007
Posts: 70
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From: NW Ohio
Sounds like your fuel selector valve is not switching. Only other thing I can think of is you possibly have a lift pump going bad. I went through 2 filters and kept blaming "gelled" fuel before I realized mine was bad. For the $25.00 I think I'd throw one on for the piece of mind. Just my .02
Post Fiend
Joined: Nov 2004
Posts: 5,638
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From: Manitoba
Fuel filter light signifies a vacuum in the filter header...... when was the last filter change.
Take the filter header Schrader valve core out and hook a hose and pressure guage to the outlet.........crank engine see what you get for pressure, should have 4-6 psi from a good lift pump.
Volume test same place hook a hose to it crank over the engine 10 seconds you should get 1/3 pint of fuel minimum or 1 pint at 675 rpm in 30 seconds... engine running
Important the fuel shutoff solenoid (FSS) wire on the IP should be disconnected if you do not want a start just cranking. Re connect FSS after test complete.
Take the filter header Schrader valve core out and hook a hose and pressure guage to the outlet.........crank engine see what you get for pressure, should have 4-6 psi from a good lift pump.
Volume test same place hook a hose to it crank over the engine 10 seconds you should get 1/3 pint of fuel minimum or 1 pint at 675 rpm in 30 seconds... engine running
Important the fuel shutoff solenoid (FSS) wire on the IP should be disconnected if you do not want a start just cranking. Re connect FSS after test complete.
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Junior User
Joined: Aug 2007
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filter was changed 2 weeks ago, gonna check the lines from tanks and selector switch this weekend, maybe change the lift pump?I have a vacuum pump, if it works, I'll try and test the filter. Thanks guys, I'll keep you posted!
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bandlgeorge
1999 - 2003 7.3L Power Stroke Diesel
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Nov 19, 2007 04:12 AM
