Question about 1999 Ford Super Duty F 450

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I have a 1999 Ford F450 super duty diesel. It

I have a 1999 Ford F450 super duty diesel. It does not start when cold. If plugged in it will start. Glow plugs have been replaced. Does not run well until it warms up. Any suggestions?

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Replace the glowplug relay.Its faulty.The glow plugs stay on until engine warms up.The engine temp switch then activates the relay to switch off.So it could be the temp switch also faulty.

Posted on Jul 17, 2009

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My truck wont start it was find but not it wont start it does crank and it sound like its going to turn on but it wont, is a diesel f450


Most probably air entered your fuel line going to the injector pump that is why the engine cranks but does not fire. You have to "bleed" the line. I'm not very familiar with F450 diesels but it's easy to locate the bleeder on the injector - it's a screw near the throttle. Loosen up the bleeder screw, crank the engine, if there's air in the line, bubbles will come out of the screw thread. Crank engine until only fuel comes out of the bleeder screw. When the engine is running already, tighten the bleeder screw.

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Hard Starting


first thing i would check is if your glow plugs are actually any good. next i would check your injectors, then the injector pump make sure it's got the needed pressure. change the fuel filter and reprime the system. if the problem still occurs then look for leaks on the fuel system considering it will start with ether tells me it's somehow losing it's prime.

May 17, 2009 | 1999 Ford Super Duty F 450

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