7.3 or 6.9 engine replacement
Thread Starter
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Mountain Pass
Joined: Jun 2022
Posts: 149
Likes: 21
From: NE Kansas
I would say, fuel in the IP is different that knowing fuel pressure and flow at the IP inlet. I would measure it before doing anything more drastic.
Then, I'd at least disassemble the FSS for a look over:
https://www.youtube.com/watch?v=ia3GIpmA26w
Then, I'd at least disassemble the FSS for a look over:
https://www.youtube.com/watch?v=ia3GIpmA26w
Edit: I read on another thread that the pumps can get clogged. Should I trying running seafoam or atf through it? I think I might try to empty the pump, leave the return line off and make sure fuel is getting in through the center inlet. Does that sound like a good idea?
Laughing Gas
Joined: May 2009
Posts: 854
Likes: 49
From: Maine
Have you cranked while a fuel line was cracked at an injector...allowing fuel to escape at the injector?
Thread Starter
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Mountain Pass
Joined: Jun 2022
Posts: 149
Likes: 21
From: NE Kansas
Yes, the first couple days all 8 we're cracked. That last few days only the 6 easy ones to get to. I even tried it with one all the way off yesterday and I didn't feel any pressure on the line.
Laughing Gas
Joined: May 2009
Posts: 854
Likes: 49
From: Maine
It feels like you are rapidly moving toward pulling the IP and having it tested.
You seem to be sure you have adequate fuel volume and pressure at the IP inlet...I am less sure.
Saying the fuel pressure spec is 1 psi at 3k rpm...I do not see how that relates to the starting issue.
I think there has to be more of a spec somewhere. Pressure and volume at 800 rpm, for instance.
I do not own a manual for that pump. A quick search makes me think you need about 7 psi at 800. But, that is internet- not fact-based.
If I were you, I would look harder than I have for the pump manual.
You seem to be sure you have adequate fuel volume and pressure at the IP inlet...I am less sure.
Saying the fuel pressure spec is 1 psi at 3k rpm...I do not see how that relates to the starting issue.
I think there has to be more of a spec somewhere. Pressure and volume at 800 rpm, for instance.
I do not own a manual for that pump. A quick search makes me think you need about 7 psi at 800. But, that is internet- not fact-based.
If I were you, I would look harder than I have for the pump manual.
Thread Starter
|
Mountain Pass
Joined: Jun 2022
Posts: 149
Likes: 21
From: NE Kansas
It feels like you are rapidly moving toward pulling the IP and having it tested.
You seem to be sure you have adequate fuel volume and pressure at the IP inlet...I am less sure.
Saying the fuel pressure spec is 1 psi at 3k rpm...I do not see how that relates to the starting issue.
I think there has to be more of a spec somewhere. Pressure and volume at 800 rpm, for instance.
I do not own a manual for that pump. A quick search makes me think you need about 7 psi at 800. But, that is internet- not fact-based.
If I were you, I would look harder than I have for the pump manual.
You seem to be sure you have adequate fuel volume and pressure at the IP inlet...I am less sure.
Saying the fuel pressure spec is 1 psi at 3k rpm...I do not see how that relates to the starting issue.
I think there has to be more of a spec somewhere. Pressure and volume at 800 rpm, for instance.
I do not own a manual for that pump. A quick search makes me think you need about 7 psi at 800. But, that is internet- not fact-based.
If I were you, I would look harder than I have for the pump manual.
Thread Starter
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Mountain Pass
Joined: Jun 2022
Posts: 149
Likes: 21
From: NE Kansas
It Runs
I got the truck running, it turned out the internals of the injection pump where bad. I got a remanufactured unit and it instantly bleed the air out. There are still many fires to put out though, one being the heater core. What size treads are the barb fittings for the heater hoses? I need to get a new one that goes on the water pump. The big long one.
Thread Starter
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Mountain Pass
Joined: Jun 2022
Posts: 149
Likes: 21
From: NE Kansas
Where should the temp sit?
My temp gauge never gets past the beginning of O in normal, is that normal (I live in north Eastern Kansas average daily temp right now is 35-45 degrees). The heater is only every warm not hot, and I put in a new heater core. I used a factory motorcraft 190 t-stat is there a chance it's an issue? Should I go for a higher temp stat?
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Fleet Mechanic
Joined: Sep 2016
Posts: 1,519
Likes: 224
From: Nevada
use one of these Infrared Heat guns and check various places
on the engine to see how hot it s getting.
HF has them also.
My 86 with 331K miles usually points to the R on normal.
The gauges on these trucks are not real accurate.
You could have some debris in the Blower (Mice nest) or
clogging the fins on the Heater core.
Also all the air goes through the AC Evaporator and the fins
on it can be clogged also.
Your Blend Air door inside the heat box may not be working,
and letting in cold air.
Goat
on the engine to see how hot it s getting.
HF has them also.
My 86 with 331K miles usually points to the R on normal.
The gauges on these trucks are not real accurate.
You could have some debris in the Blower (Mice nest) or
clogging the fins on the Heater core.
Also all the air goes through the AC Evaporator and the fins
on it can be clogged also.
Your Blend Air door inside the heat box may not be working,
and letting in cold air.
Goat
Thread Starter
|
Mountain Pass
Joined: Jun 2022
Posts: 149
Likes: 21
From: NE Kansas
use one of these Infrared Heat guns and check various places
on the engine to see how hot it s getting.
HF has them also.
https://www.amazon.com/Etekcity-Lase...00837ZGRY?th=1
My 86 with 331K miles usually points to the R on normal.
The gauges on these trucks are not real accurate.
You could have some debris in the Blower (Mice nest) or
clogging the fins on the Heater core.
Also all the air goes through the AC Evaporator and the fins
on it can be clogged also.
Your Blend Air door inside the heat box may not be working,
and letting in cold air.
Goat
on the engine to see how hot it s getting.
HF has them also.
https://www.amazon.com/Etekcity-Lase...00837ZGRY?th=1
My 86 with 331K miles usually points to the R on normal.
The gauges on these trucks are not real accurate.
You could have some debris in the Blower (Mice nest) or
clogging the fins on the Heater core.
Also all the air goes through the AC Evaporator and the fins
on it can be clogged also.
Your Blend Air door inside the heat box may not be working,
and letting in cold air.
Goat
Logistics Pro
Joined: Jun 2017
Posts: 3,963
Likes: 512
From: Edmond, OK
Good to hear you got her running though.
Fleet Mechanic
Joined: Sep 2016
Posts: 1,519
Likes: 224
From: Nevada
Here are a few links I saved about the heat system and repairs.
https://www.ford-trucks.com/forums/1...-needed-3.html
https://www.ford-trucks.com/forums/1...oor-hinge.html
https://www.garysgaragemahal.com/hvac-systems.html
New seals.
https://www.detroitmuscletechnologie...uild-seal-kit/
Charlie
https://www.ford-trucks.com/forums/1...-needed-3.html
https://www.ford-trucks.com/forums/1...oor-hinge.html
https://www.garysgaragemahal.com/hvac-systems.html
New seals.
https://www.detroitmuscletechnologie...uild-seal-kit/
Charlie
Thread Starter
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Mountain Pass
Joined: Jun 2022
Posts: 149
Likes: 21
From: NE Kansas
Issues
I've got major issues.
the truck is loosing prime somehow, it runs then dies then it cranks forever before starting. Now today it started surging then would go back to normal driving. Then it devolved a dead miss on at least one cylinder, and started shaking violently. What the heck is wrong it's got a remanufactured injection pump on it? I don't think it's out of fuel the guage is still at 1/4 tank.
the truck is loosing prime somehow, it runs then dies then it cranks forever before starting. Now today it started surging then would go back to normal driving. Then it devolved a dead miss on at least one cylinder, and started shaking violently. What the heck is wrong it's got a remanufactured injection pump on it? I don't think it's out of fuel the guage is still at 1/4 tank.
Fleet Mechanic
Joined: Jun 2009
Posts: 1,312
Likes: 327
From: San Antonio, TX
I've got major issues.
the truck is loosing prime somehow, it runs then dies then it cranks forever before starting. Now today it started surging then would go back to normal driving. Then it devolved a dead miss on at least one cylinder, and started shaking violently. What the heck is wrong it's got a remanufactured injection pump on it? I don't think it's out of fuel the guage is still at 1/4 tank.
the truck is loosing prime somehow, it runs then dies then it cranks forever before starting. Now today it started surging then would go back to normal driving. Then it devolved a dead miss on at least one cylinder, and started shaking violently. What the heck is wrong it's got a remanufactured injection pump on it? I don't think it's out of fuel the guage is still at 1/4 tank.
Thread Starter
|
Mountain Pass
Joined: Jun 2022
Posts: 149
Likes: 21
From: NE Kansas
Alright I put 5 gallons in the truck. Runs like a top, zero issues. I'm guessing that foot in the tank is broken off, so for now on I'm keeping the truck above 1/4 tank. Happy it seems to have been a simple fix.