fuel heater
Postmaster
Joined: Apr 2009
Posts: 4,086
Likes: 1
From: Malahat/Cowichan Valley
the 7.3's have them in the filter assembley head. I am not sure about the 6.9's and as an added bonus, mine is a 7.3 and doesnt have one. Depends on where it was made/sent i believe. If you have wires attached to the top of the filter head unit then you have one.
Postmaster
Joined: Apr 2009
Posts: 4,086
Likes: 1
From: Malahat/Cowichan Valley
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Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
My guess is it does not work, the wires are probably corroded off.
Unless you are in a very cold location, you should not need it anyway.
If you are in a cold location, just run some extra anti gell addative and you will be fine.
Unless you are in a very cold location, you should not need it anyway.
If you are in a cold location, just run some extra anti gell addative and you will be fine.
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Brett Foote
Senior User
Joined: Nov 2007
Posts: 334
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From: McFarland, WI
On my 87 6.9L my wires were all corroded and i was having fuel problems. I wasnt sure if that could be restricting anything so i took it out and replace it with a braided fuel line. looks better and i dont have to worry if it works or not. Ive had no fuel problems and I live in WI. It was -15 with the wind the other day and no problems. Like Dave said, a little addative and dont worry about it. If you do want it im sure you could jump 12v to it and check it with a laser thermometer to see if it heats up. as for if you temp sensor turns it on...well thats another story. I guess you could wait for a cold morning and hook up a test light to the wire thats sticking out from the heater element. then click your key forward and see if your getting power. like i said i dont have to worry about it but this is how i would go about testing it
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New User
Joined: Oct 2009
Posts: 9
Likes: 0
thanks guys,I will try to test it. The last couple years I have noticed that in real cold weather it seems a little starved for fuel. -10 to -15 and below and I have never had these issues before and have never had to add any additive either. running the old gm 5.7s back in the 80s I would mix kerosene in the tank and never had a problem but have never done it in this 6.9
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New User
Joined: Oct 2009
Posts: 9
Likes: 0
good to know,whats best? also a little off the subject but how many miles should I expect get out of an ip. I rebuilt it at 86k and was told it should be good indefinitly if I used treatment,which I did for the first 4 years or so but only once in a while nowdays. I now have about 300k on the truck.
Post Fiend
Joined: Oct 2007
Posts: 10,501
Likes: 5
From: Faibanks Ak.
Personally I have had IP's last close to 300,000 miles but I really think for optimum power and fuel milage 100,000 to 150,000 for the IP and injectors would be best.
I have come to the conclusion that perforormance detiorates so slowly that I don't even really realise it until she is performing way below par.
This would also depend on the quality of fuel you use and I think with the new fuel formulas they will not last as long with out additives as they used too.
Ps there was a billboard leaving coldfoot going north that said the new fuel was not guaranteed to even run after this point.
I have come to the conclusion that perforormance detiorates so slowly that I don't even really realise it until she is performing way below par.
This would also depend on the quality of fuel you use and I think with the new fuel formulas they will not last as long with out additives as they used too.
Ps there was a billboard leaving coldfoot going north that said the new fuel was not guaranteed to even run after this point.
Post Fiend
Joined: Oct 2007
Posts: 10,501
Likes: 5
From: Faibanks Ak.
This is just my opinion. (no scientific facts here) It has been my experiance that after I have thought a motor was just tired the IP would finally give up and new IP and injectors would run like new again when I thought it was wore out for a year or two.