Keith Browning Posted March 14, 2008 Share Posted March 14, 2008 I thought I had a topic going on this a few months back and cant seem to find it. It was an 06 E450 that was towed in a few times for a no crank/no start condition. I assisted the tech who drifted off in the wrong direction and we quickly determined that the fuel heater was shorted causing the PCM power relay to open. I don't know why Ford had to tie those two to the same fuse?!?! He replaced the HFCM and the fuse, we didn't give it another thought. It was towed back in a couple of weeks later and for some reason I draw a blank as to what was done, maybe a clogged fuel filter... truck leaves only to return on a hook a day later. Now it's mine and I discovered the PCM/fuel heater fuse open again. /forums/images/%%GRAEMLIN_URL%%/scratchhead.gif So I isolated the circuit by disconnecting everything again and once again, found the fuel heater shorted! No shit! I called the Hot-Line on this for some reason and the Engineer told me that he had a run in with this when he was still a tech shortly before coming to Ford. "Look for rust on the fuel heater plate in the HFCM. You will have to destroy it to gt it out" So I did and this is what I found. Long story short, rust can still retain conductive properties of the metal. Remember, this HFCM/heater is only a couple of weeks old. The fuel inlet of the HFCM dumps the fuel right onto this heater assembly and if there is rust in the fuel, guess where it lands? So, a new HFCM, fuel tank and sender this puppy has not been seen since. P.S. I could swear I posted this and I was just waiting to add the picture. /forums/images/%%GRAEMLIN_URL%%/shrug.gif Quote Link to comment Share on other sites More sharing options...
GregH Posted March 14, 2008 Share Posted March 14, 2008 Nice one, Keith. Down here in the south, we don't have as many problems with rust - so it may be a while before we see this kind of thing. I'll keep that in the back of my mind... Quote Link to comment Share on other sites More sharing options...
slim Posted March 15, 2008 Share Posted March 15, 2008 So you're saying rust in the fuel is sticking to the heater and causing the short, not the heater rusting? Did you find the fuel tank delaminated? This goes to show why they should have the filter before the fuel enters the HFCM or a filter in the tank like the 7.3. Quote Link to comment Share on other sites More sharing options...
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