91 F250 5.8 no start

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plowboy34
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91 F250 5.8 no start

Post by plowboy34 »

when I turn key to on the fuel pump comes on but just keeps running and the truck won't start. The pump doesn't run a couple seconds the quit like it's suppose it just keeps running. Yes I know there is fuel in the tank.... :D Actually I can switch to both tanks and it does the samething. Any help would be appreciated. As you guys know I am EFI dumb.
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77 Mustang II 302, C4, 8" rearend 3:00 gears, 4 point roll bar
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carvinmark
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Re: 91 F250 5.8 no start

Post by carvinmark »

Is it getting any spark?
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cgrey8
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Re: 91 F250 5.8 no start

Post by cgrey8 »

When the fuel pump doesn't turn off, this means the EEC is locked up and not executing code. The EEC has to "turn OFF" the fuel pump, not turn it ON. So if the EEC has gone stupid (bad tune, blown processor, no power, etc), the fuel pump will run constantly like that.
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plowboy34
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Re: 91 F250 5.8 no start

Post by plowboy34 »

Hey chris, will that cause the truck not to start.
Dirt is for Farming....Asphalt is for Racing

85 Ranger 5.0, GTP Engine, Carbed, AOD, 7.5 3:45 rear gear(for now)
77 Mustang II 302, C4, 8" rearend 3:00 gears, 4 point roll bar
73 Mustang Convertible, Bone Stock, 48,000 original miles
91 F-250 5.8W(really needs a 460) 4X4
2000 Mustang 3.8 V6, Bone Stock
2011 Ford Fusion (Momma's hot rod)
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cgrey8
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Re: 91 F250 5.8 no start

Post by cgrey8 »

If the EEC isn't executing, oh yeah. Without the EEC executing, the injectors won't fire.
...Always Somethin'

89 Ranger Supercab, 331, ported GT40p heads w/1.6RRs, Crane Powermax 2020 cam, ported Explorer lower, FMS Explorer (GT40p) headers, aftermarket T5 'Z-Spec', 8.8" rear w/3.27s, Powertrax Locker, A9L w/Moates QuarterHorse, Innovate LC-1, James Duff traction bars, iDelta DC Fan controller

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plowboy34
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Joined: Sat Dec 11, 2004 11:56 pm
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Re: 91 F250 5.8 no start

Post by plowboy34 »

Thanks Chris
Dirt is for Farming....Asphalt is for Racing

85 Ranger 5.0, GTP Engine, Carbed, AOD, 7.5 3:45 rear gear(for now)
77 Mustang II 302, C4, 8" rearend 3:00 gears, 4 point roll bar
73 Mustang Convertible, Bone Stock, 48,000 original miles
91 F-250 5.8W(really needs a 460) 4X4
2000 Mustang 3.8 V6, Bone Stock
2011 Ford Fusion (Momma's hot rod)
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