How do I determine if my lift/fuel pump is bad - Diesel Forum - TheDieselStop.com
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6.9L Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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Old 01-05-2007, 03:13 AM   #1 (permalink)
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How do I determine if my lift/fuel pump is bad

I am trying to rule out if my lift/fuel pump is bad,when cold the motor turns freely and it seems the engine just is on the verge of starting,once the motor starts in the morning it starts all day like a champ. I have replaced GP contoller,glow plugs,and return lines, I also heard from a mechanic that if i were to replace the lift pump that i make sure the actuator cam in the motor be on the lowest position. is this necessary?
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Old 01-05-2007, 04:53 AM   #2 (permalink)
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Re: How do I determine if my lift/fuel pump is bad

Do a pressure and flow test of the fuel pump at the Schrader valve on the filter header (FSS- fuel shutoff solenoid disconnected on IP). Remove the tire valve core and hook a hose and pressure guage on it should see 4-6 psi when cranking. Then do a fuel quantity test same place, should see 1/3 pint in 10 seconds of engine cranking, route fuel to a suitable container with a hose.

If there is a problem with the lift pump and you are changing it, ensure the new pump comes with instructions as to correct installation procedure if it is the newer model pump with the almost straight arm.

This info pertains to Carter #M60278 pump or new long arm style.

WARNING

This fuel pump must be installed only at the low position of actuator cam.

If the pump is installed at any other position than low cam, the pump will be ruined, the engine will stall and damage may result.

Incorrect installation will loosen the pivot pin and allows the pin and lever to come out of the pump and drop into the oil pan. This can occur immediately or after several hundred miles. This type of failure is not covered by warranty.

To ensure that the cam is at low position, it is necessary to use a mirror and a remote starter switch. Observe the cam through the mounting port and bump the engine around until a one (1) inch wide machine surface is observed. This is low position of the cam. Now complete normal fuel pump installation.

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Old 01-05-2007, 04:18 PM   #3 (permalink)
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Re: How do I determine if my lift/fuel pump is bad

Why trouble shoot?
It is a cheap, and an easy installation.
$25 and 2 hours of easy work.
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Old 01-06-2007, 11:16 AM   #4 (permalink)
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Re: How do I determine if my lift/fuel pump is bad

I am asking the question because I am trying to chase down a cold start problem.I didnt want to waste time on a good part.
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Old 01-06-2007, 11:29 AM   #5 (permalink)
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Re: How do I determine if my lift/fuel pump is bad

I ended up changing the lift pump because it was one of the contributors to my problem, One interesting thing i found out was the new long arm on the carter pump, It was completely different from my old pump and so i took it over to napa and they said that carter made the arm longer to ride on the bottom of the lobe shaft rather than the side of the lobe shaft. I was told that many people were installing the old style arm into the motor incorrectly, the arms could be installed on top of the lobe and cause a upward motion to the arm rather than a downward motion so that it would not pump any fuel but possibly mar the lobe shaft or worse.

a quick note:
after installing the new pump i noticed something that i always took for granted,when i was bleeding air from the schrader valve before the new pump I would see lots of very small bubbles,now the fuel comes out in a solid stream.
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Old 01-06-2007, 11:41 AM   #6 (permalink)
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Re: How do I determine if my lift/fuel pump is bad

[ QUOTE ]
I didnt want to waste my time

[/ QUOTE ]

Exactly my point!!

I will ask a question, that no one likes to answer,
How old is the existing lift pump?
How long do you expect it to last?
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