Does this sound like a fuel issue

Gamble

Member
120
22
18
Location
Los Angeles, CA
I believe the truck has a fuel feed issue because it cuts off after running for a short while. It will idle fine for quite some time after being started. However, when it comes to driving... Maybe 2 minutes max time. If I just gently touch the pedal while driving (think a touch over idle) and hold it... It's fine.
But if I step on the pedal to accelerat it will respond initially then it becomes somewhat unresponsive, idles , then shuts off abrubtly everytime. Then I have to restart it, by pushing the gas pedal extensively.
 

simp5782

Feo, Fuerte y Formal
Supporting Vendor
9,635
2,674
113
Location
Memphis, TN
I believe the truck has a fuel feed issue because it cuts off after running for a short while. It will idle fine for quite some time after being started. However, when it comes to driving... Maybe 2 minutes max time. If I just gently touch the pedal while driving (think a touch over idle) and hold it... It's fine.
But if I step on the pedal to accelerat it will respond initially then it becomes somewhat unresponsive, idles , then shuts off abrubtly everytime. Then I have to restart it, by pushing the gas pedal extensively.
When it dies, pour cold water on the injection pump and see if it restarts immediately. The db2 pumps were bad about this when they get hot
 

Gamble

Member
120
22
18
Location
Los Angeles, CA
When it dies, pour cold water on the injection pump and see if it restarts immediately. The db2 pumps were bad about this when they get hot
I'll take a look at that. Also, I don't know if this helps with the diagnosis but I also get this trickle of smoke https://ibb.co/wJHmcWQ when pumping the gas pedal and working the truck to start. I also see a tiny bit of smoke come from under the hood close to the windshield.
 

BLK HMMWV

Well-known member
1,307
68
48
Location
Pasadena California
I'm guessing you replaced the fuel filter , air filter, oil filter and did all the PM's as soon as you got it home?
Or did you just put fuel in it and drive it?
 

papakb

Well-known member
Steel Soldiers Supporter
1,785
307
83
Location
San Jose, Ca
Make sure the #54 connector is firmly seated in the top of the IP. If it's intermittant it will shut off the fuel feed. You can connect a test lead there and run it to a meter that you can read while driving to see if your losing your 24v feed to the IP while your driving. You don't happen to have a keyed ignition switch in the truck do you? They're notorious for this.
 

Gamble

Member
120
22
18
Location
Los Angeles, CA
Make sure the #54 connector is firmly seated in the top of the IP. If it's intermittant it will shut off the fuel feed. You can connect a test lead there and run it to a meter that you can read while driving to see if your losing your 24v feed to the IP while your driving. You don't happen to have a keyed ignition switch in the truck do you? They're notorious for this.
No keyed ignition switch. I was warned against those. :) I will check the #54 connector
 

Milcommoguy

Well-known member
804
296
63
Location
Rosamond, CA
Note that there is a small input filter screen in the IP. Not saying this is the problem, But all gunkie, crud, gummed up fuel from who knows where and how long and did it ever run right?

Check out the recent posts with like issues. My free two cent guess... thinking fuel or a big rats nest in the air box. :poop:

Here's an easy to read help > See the fuel section.


Not so easy to get to filter screen. It's a HMMWV, CAMO
 

TNDRIVER

New member
9
6
3
Location
Cleveland,TN
I believe the truck has a fuel feed issue because it cuts off after running for a short while. It will idle fine for quite some time after being started. However, when it comes to driving... Maybe 2 minutes max time. If I just gently touch the pedal while driving (think a touch over idle) and hold it... It's fine.
But if I step on the pedal to accelerat it will respond initially then it becomes somewhat unresponsive, idles , then shuts off abrubtly everytime. Then I have to restart it, by pushing the gas pedal extensively.
I have a suggestion, remove your fuel filter housing from the firewall and inspect it. If it has a slimy black looking substance in the bottom your fuel is contaminated. It stops up the water strainer ( the green thing) . If you were not aware you can get microorganisms growing in the fuel. I have owned large trucks for over 38 years and have had more trouble with the HMMWV than all the big trucks. I regularly treat my fuel (every fueling ) with a biocide. Sounds exactly like my fueling problem, Good Luck
 

Action

Well-known member
2,100
89
48
Location
East Tennessee
Anyone know what the T line in the picture is supposed to connect to https://ibb.co/7Y273LQ
Mine isn't attached to anything on the right side as you can see.
look or feel the bottom of the hydroboost.
EDIT: That may get it's own line. Check power steering reservoir and top of master cylinfder (plastic versions).
It looks like a vent line to me.
 
Last edited:

Gamble

Member
120
22
18
Location
Los Angeles, CA
look or feel the bottom of the hydroboost.
EDIT: That may get it's own line. Check power steering reservoir and top of master cylinfder (plastic versions).
It looks like a vent line to me.
It is a vent line but I just dont know where the far end attaches and the manuals don't seem to specify
 

Action

Well-known member
2,100
89
48
Location
East Tennessee
It is a vent line but I just dont know where the far end attaches and the manuals don't seem to specify
Did you look for the vent line on top of the power steering reservoir and other parts to see where it goes?
Also, If the fording switch is missing, that could be another destination. If the switch is there, remove the doghouse and feel the back of the switch. There are 3 connections on it.
 

topo

Active member
828
78
28
Location
farmington NM
I have had trouble on equipment through the years with different types of fuel lines where the inner liner separates from the outer part of the hose some times it happens near a heat source . It seams the equipment will start and run but when more more fuel is pulled through the line the in side liner collapse and stopes the fuel and when off and no suction the liner opens back up and the equipment will restart .
 

TNDRIVER

New member
9
6
3
Location
Cleveland,TN
I did notice this when under the truck but may not be related. Looks like fuel smoke coming out of the exhaust pipe as it's missing a bolt.
Topo is right the lines can collapse but they are rather short on the suction side on the trucks. The pickup sock in the fuel tank is also suspect along with the IP screen, though I don't have any experience with the IP screen. I just replaced the sock and fuel sender (rusted away) in a truck with 84 miles on it. There was a biology experiment in the bottom of the tank. Something you might try at your own risk, you didn't hear it from me. Add about a pint of transmission fluid to the fuel and run the truck for a short while and the let it set, repeat a couple of times, run set. Transmission fluid is loaded with detergent and cleans gunk pretty good. (They are probably going to come out of the woodwork on this one.) I would deffinetly pull the sender and look at the sock and bottom of the tank though. Good luck!
 

Coug

Well-known member
1,062
573
113
Location
Olympia/WA
Topo is right the lines can collapse but they are rather short on the suction side on the trucks. The pickup sock in the fuel tank is also suspect along with the IP screen, though I don't have any experience with the IP screen. I just replaced the sock and fuel sender (rusted away) in a truck with 84 miles on it. There was a biology experiment in the bottom of the tank. Something you might try at your own risk, you didn't hear it from me. Add about a pint of transmission fluid to the fuel and run the truck for a short while and the let it set, repeat a couple of times, run set. Transmission fluid is loaded with detergent and cleans gunk pretty good. (They are probably going to come out of the woodwork on this one.) I would deffinetly pull the sender and look at the sock and bottom of the tank though. Good luck!
I thought that ATF was more for cleaning sticking injectors and stuff like that, but yes, it has a lot of detergents and will burn just fine in a diesel engine.
 
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website like our supporting vendors. Their ads help keep Steel Soldiers going. Please consider disabling your ad blockers for the site. Thanks!

I've Disabled AdBlock
No Thanks