cat 3116 engine fuel filter runs dry and engine stalls

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ARMY GUY

Castries, Saint Lucia

#1 May 2, 2012
Hi,
We operate a fleet of 7 trucks with 5 3116 engines and 2 3126 engines. Two of the 3116's developed a problem of misfiring. We replaced the fuel filters with originals and then the situation subsided. It started again and all of a sudden the filters now go empty. We have swapped fuel pumps from working ones and the problem havent seem to be arrested. Is there something that i can look into to assist me in getting the engines running back to the original state.
I have also tried to put in some new injectors and that still havent sorted out the issue.
Ken

Marion, IN

#2 May 2, 2012
ARMY GUY wrote:
Hi,
We operate a fleet of 7 trucks with 5 3116 engines and 2 3126 engines. Two of the 3116's developed a problem of misfiring. We replaced the fuel filters with originals and then the situation subsided. It started again and all of a sudden the filters now go empty. We have swapped fuel pumps from working ones and the problem havent seem to be arrested. Is there something that i can look into to assist me in getting the engines running back to the original state.
I have also tried to put in some new injectors and that still havent sorted out the issue.
The problem is with the "fuel pressure regulator", not the pump, or the injectors. The 3116 has a series of check valves that regulate the fuel rail pressure throughout the engine. I imagine the last check valve, where the return fuel is leaving the head & returning to the fuel tanks, is not functioning properly.

This will cause the fuel flow to "speed up" through the head & suck the filters dry. It can also cause the engine to "lose" it's prime overnight, as well. When this happens on our C-15's, I unscrew the little regulator & replace it...problem solved!

If you need complete diagrams of the 3116 fuel system, give me an e-mail address & I'll send them to you :)
ARMY GUY

Castries, Saint Lucia

#3 May 3, 2012
Thanks KEN. You can send them at gcassius@gosl.gov.lc.

Today we did try to road test. Engine started good then under pressure going up hill, lost all power. We had to stop allow to idle, rev out and then we regain some power.
ARMY GUY

Castries, Saint Lucia

#4 May 4, 2012
Got the information and thanks. Looking to switch the regulator to see what happens.
ARMY GUY

Castries, Saint Lucia

#5 May 7, 2012
KEN,

The guys opened some stuff on the line where we got a spring loaded mechanism looking like a small windmill on one side and a steering wheel on the other. they were cleaned and replaced. Engine does the same thing. Misfiring under pressure and when left to rest its full power again.
Anhy other suggestions.
dieselmonkey

Peterborough, Canada

#6 May 10, 2012
You need to check retuen fuel line with clear sight glass installed and look for air in fuel.(bubbles in sight glass).
Also I bet this engine will be in a GMC truck, with plastic fuel lines coming from tank. These had alot of problems sucking air. need to replace lines from tank to steel connector lines at rear of engine.
Matt

Martinton, IL

#7 Jul 4, 2012
ARMY GUY wrote:
Thanks KEN. You can send them at gcassius@gosl.gov.lc.
Today we did try to road test. Engine started good then under pressure going up hill, lost all power. We had to stop allow to idle, rev out and then we regain some power.
Hi, I have the same problem losing all power going up any kind of hill. did you find the problem. Thanks

“Cat & Cummins ECM programs”

Since: Jun 12

Marion, IN

#8 Jul 4, 2012
Matt wrote:
<quoted text>
Hi, I have the same problem losing all power going up any kind of hill. did you find the problem. Thanks
I guess they solved the problem, because I never heard from them again here on this site, or in an e-mail. I would check every fuel line from the tank to engine & look for leakage, as DieselMonkey suggested. If you need diagrams of the fuel system, tell me where to send them :)
Pooley

Oxford, GA

#9 Nov 16, 2012
I also have that same prob like its running out of fuel going up hill. And get back on level road it clears up.... HELP....
Pooley

Oxford, GA

#10 Nov 16, 2012
Oh yea forgot to mention its 3116 cat. And cleaned out tank replaced plastic fuel lines and put all new o-rings at all fuel line connections....
Pooley

Oxford, GA

#11 Nov 16, 2012
Can some one tell me where the fuel pressure regulater is located on my cat 3116 engine.. Thanks

“Cat & Cummins ECM programs”

Since: Jun 12

Marion, IN

#12 Nov 16, 2012
Pooley wrote:
Can some one tell me where the fuel pressure regulater is located on my cat 3116 engine.. Thanks
Give me an e-mail address & I'll send you a complete diagram of your fuel system.
Pooley

Oxford, GA

#13 Nov 17, 2012
poole_david@bellsouth.net thanks.
anami

Port Angeles, WA

#14 Nov 19, 2012
Ken Mech wrote:
<quoted text>
Give me an e-mail address & I'll send you a complete diagram of your fuel system.
i have the same engine and would LOVE a diagram of any system ;) im having trouble finding a manual for it that i can afford. and the fuel system woudl be VERY helpful now as i am doing my veg conversion bohemiansale@gmail.com if you can please and thank you!
Losier

Fredericton, Canada

#15 Dec 6, 2012
I would also appreciate a fuel system diagram please . zr__23@hotmail.com
thanks
Ken Mech wrote:
<quoted text>
Give me an e-mail address & I'll send you a complete diagram of your fuel system.
Gord

Petawawa, Canada

#16 Dec 29, 2012
Same issue with me,could you please email me a drawing,gordcostello@gmail.com
Thanks

“Cat & Cummins ECM programs”

Since: Jun 12

Marion, IN

#17 Dec 30, 2012
Gord wrote:
Same issue with me,could you please email me a drawing,gordcostello@gmail.com
Thanks
I sent out one to everybody listed above. Best of luck!
my name is JR

Gainesboro, TN

#18 Jan 9, 2013
Ken wrote:
<quoted text>
The problem is with the "fuel pressure regulator", not the pump, or the injectors. The 3116 has a series of check valves that regulate the fuel rail pressure throughout the engine. I imagine the last check valve, where the return fuel is leaving the head & returning to the fuel tanks, is not functioning properly.
This will cause the fuel flow to "speed up" through the head & suck the filters dry. It can also cause the engine to "lose" it's prime overnight, as well. When this happens on our C-15's, I unscrew the little regulator & replace it...problem solved!
If you need complete diagrams of the 3116 fuel system, give me an e-mail address & I'll send them to you :)
my filter on side of block is running dry when engine dies down can i nget fuel diagram please thanks melindakirkpatrick70@yahoo.com
my name is JR

Gainesboro, TN

#19 Jan 9, 2013
Gord wrote:
Same issue with me,could you please email me a drawing,gordcostello@gmail.com
Thanks
could you send me that drawing please melindakirkpatrick70@yahoo.com
my name is JR

Gainesboro, TN

#20 Jan 9, 2013
Losier wrote:
I would also appreciate a fuel system diagram please . zr__23@hotmail.com
thanks
<quoted text>
would you mind sharing that fuel system diagram please melindakirkpatrick70@yahoo.com

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