Stranded, please help
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Laughing Gas
Joined: Nov 2007
Posts: 824
Likes: 179
Stranded, please help
Was pretty low on fuel but didn't think that low. Truck fired after work then died 1/4 mile later. Symptoms are similar to running out of fuel. Added 6 gallons and cycled key many times to prime, acts like it wants to catch but won't fire. Ran perfect until this, no delayed cranks or anything. Bone stock with 165k miles, original FICM. I even tried bleeding the fuel filter cap thinking air in lines.
Suggestions?
Suggestions?
Postmaster
Joined: Sep 2016
Posts: 3,941
Likes: 240
From: Texas
Fill the upper filter bowl with just enough diesel to put the filter back in without overflowing, cap it and cycle the key until you get fuel pressure. It will take some fuel because it will have to fill the fuel line and HFCM housing too. Once it’s got fuel it can prime. Without doing this the pump is just spinning and moving no fuel. This is where a fuel pressure gauge comes in handy. If no gauge then listen for the hum of the fuel pump that’s in the HFCM on the framerail under the driver’s seat. It will sound different once it catches prime.
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
One other thing Have the hood up so after the key on event go out and listen near the fuel filter assembly. If you hear what sounds like air hissing you still
do have air in the system you need to move out. When it's all air once you get some fuel into the HCFM it can take a bit to get it all refilled. The air sound
is like a flat on a bicycle tire slowing going down. What that is if you have done a blue spring and recall that little plastic part with the tiny O-ring. If you look
close at the plastic part at the top you will see a tiny hole and that is how the air gets routed back to the tank. Give it about 2 minutes between key cycles.
do have air in the system you need to move out. When it's all air once you get some fuel into the HCFM it can take a bit to get it all refilled. The air sound
is like a flat on a bicycle tire slowing going down. What that is if you have done a blue spring and recall that little plastic part with the tiny O-ring. If you look
close at the plastic part at the top you will see a tiny hole and that is how the air gets routed back to the tank. Give it about 2 minutes between key cycles.
Tuned
Joined: Oct 2015
Posts: 392
Likes: 86
From: Roebuck, SC
Could be the pick up tube in the fuel tank. Mine has that issue. I can't get below 1/4 tank or it will shut off. There's a plug (or something) that falls out that's right at the 1/4 tank level.
I plan to drop the tank and replace the pickup tube some day, maybe. Until then, I fill up between 1/2 and 1/4.
I plan to drop the tank and replace the pickup tube some day, maybe. Until then, I fill up between 1/2 and 1/4.
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Laughing Gas
Joined: Nov 2007
Posts: 824
Likes: 179
Thanks everyone. Was doing all this in the rain at night, eventually got towed home late. I filled filter bowl once but it ran empty...I will keep filling it next attempt until all air is out. Won't be able to mess with it until Sunday night. Thanks guys!
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Hotshot
Joined: Dec 2014
Posts: 17,823
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From: Jersey Shore
You shouldn't have to do that, the system is self priming. However, you might want to check the fuel pressure regulator seal once all else fails. But installing a pressure gauge permanently or as a test instrument would take the guesswork out of all this.
If you have the icing bypass valve fail in the tank pickup foot 1/4 tank is about empty.
If you have the icing bypass valve fail in the tank pickup foot 1/4 tank is about empty.
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Fleet Owner
Joined: Apr 2012
Posts: 27,307
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From: Spanaway
Could be the pick up tube in the fuel tank. Mine has that issue. I can't get below 1/4 tank or it will shut off. There's a plug (or something) that falls out that's right at the 1/4 tank level.
I plan to drop the tank and replace the pickup tube some day, maybe. Until then, I fill up between 1/2 and 1/4.
I plan to drop the tank and replace the pickup tube some day, maybe. Until then, I fill up between 1/2 and 1/4.
if the HFFCM senses the fuel temp is too high. It also vents air back into the tank when priming a system. Thad problem is
when that little one way valve falls off or gets hard and no longer seals. When that happens air can be drawn back into the
fuel system once you below 1/4 tank. If you think this is the issue and it's a moderate pain to replace I would fill the tank up
to about 1/3 and try. Other wise there are other things that can cause a no start do to lack of fuel.
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Laughing Gas
Joined: Nov 2007
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Likes: 179
Update: Got it running. Took filling the filter bowl again and a handful of full 20-25 second primes for it to fire. After idling for a few minutes I heard air hissing and fuel pissing upon shut down = o-ring on the water in fuel sensor was not sealing. So it seemed to be a couple problems. All is well now. I may replace the FICM soon as preventive maintenance since the original has 165k on it.
Fleet Owner
Joined: Apr 2012
Posts: 27,307
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From: Spanaway
Did you whack the sensor when seating it? From what I could tell it is a very tight fit.
If the FICM is putting out 48V don't bother doing anything to it.
BTW bleeding air goes like this. Turn key on to run, Wait until the pump stops.
Then turn the key off and wait 1 to 2 minutes for the air that is now compressed
in the bowl to bleed out. You in normal cases only need to do this 3 times.
However if you have had dry lines it can take more cycles. The last time I. had
one down and dry I did about 6 or 7 cycles. BTW they take a lot of power do to
the glow plugs coming on because you are not showing the PCM any heat from
running. Best thing to do in this case is to unplug the glow plug module at the
2 connectors one green and one black. That should save the battery and unnecessary
glow plug heating.
If the FICM is putting out 48V don't bother doing anything to it.
BTW bleeding air goes like this. Turn key on to run, Wait until the pump stops.
Then turn the key off and wait 1 to 2 minutes for the air that is now compressed
in the bowl to bleed out. You in normal cases only need to do this 3 times.
However if you have had dry lines it can take more cycles. The last time I. had
one down and dry I did about 6 or 7 cycles. BTW they take a lot of power do to
the glow plugs coming on because you are not showing the PCM any heat from
running. Best thing to do in this case is to unplug the glow plug module at the
2 connectors one green and one black. That should save the battery and unnecessary
glow plug heating.
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