I have a fuse/running problem. I was driving and she died, fuel pump ok, but it still blows fuse #30 as soon as the key turns over. also the wait to start light no longer comes on. I've checked every post on this site and will check the cam sensor as indicated on another post. Any other ideas?

 

if it is blowing a fuse every time you turn it on you probably have a short to power, or short to ground somewhere, if you have had anything installed lately start looking there, otherwise you will have to find out what fuse 30 controls, and follow the wire to find the break.

 

Hi,

First post here. Just bought a '99 F250 Super Duty extended cab. 8" lift, rolling on 37 inch tires. 222,000 miles at purchase and looking forward to many more.

I had this exact problem with my truck and I didn't see a response so I thought I'd introduce myself and post what I found.

The fuel heater element was shorting out blowing fuse #30. #30 also controls the ECM so the 'wait to start' light didn't come on and the big clue was there was no tach signal during cranking. I unplugged the fuel heater from the filter and problem solved. Just in case someone runs up against this in the future.

According to the owners manual, there's a lot of things running from fuse 30. A little questionable design IMO that blowing that fuse on an unrelated and non-critical item like the fuel heater can prevent the truck from starting. When I unplugged the heater, it was about 17degF out. The heater must not do that much to help starting in the cold.

Hi all and glad to have found this forum. I'm sure I'll have a lot of questions going forward. I'm a pretty competent mechanic but this is my first Ford truck and my first diesel so I have a lot to learn

-Peter

 

The fuel heater/water in fuel sensor are on fuse 30.. As well as thewaste gate control solenoid.. Try unpluging the the fuel heater/water sensorfirst..Sometimes they break loose from the mounting plate..Then if the fuse still pops, try the waste gate control solenoid...

 

Welcome Peter...

Power to the PCM diode/relay is through fuse 30... Youtype fast!! Good call.....


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Same problem here with my 99 F250. I haven't had my fuel heater plugged in for about 5 years now.
It was -2degF yesterday morning and 0degF this morning, and the truck cranked. It didn't want to. Sounded likea rundown farm tractor for about 5 minutes before everything warmed up.

So, I have a question. What exactly is the purpose of the fuel heater if my truck will still crank in these cold temperatures? Or maybe i should ask about the effectiveness of the fuel heater? Doesn't seem to do much for anyone except blow fuses.

I'm from Louisiana, so I'd completely forgotten about the fuel heater problem until the temp dropped so low here in KY the past few days and my truck struggled to crank.

 

Lol-hi i am from louisiana and have unplugged many of them on all the 7.3l year models (the parts are exspensive and dealership owned -really no need for it under a sustained temperature-(20 deg's or lower for a few days or more)-but where the weather is alot colder than down here-i would replace it -it is a very easy part to replace if you feel you need it,mark.