Testing lift pump pressure.
#1
Testing lift pump pressure.
I'd like to check the health of my lift pump to see if it's contributing to my fuel system issues.
Flow and pressure.
Can someone outline this procedure? I understand you need a special banjo fitting going to the CP3 to test pressure? Does anyone have a Cummins part # for this fitting?
Flow and pressure.
Can someone outline this procedure? I understand you need a special banjo fitting going to the CP3 to test pressure? Does anyone have a Cummins part # for this fitting?
#5
This project has been on hold this winter. I even drove a F*rd most of the time.
I went ahead, drained the fuel filter housing and put a 2 litre jug under the open drain hose.
Bumped the key and found that i got only about 600 mls of fuel letting the lift pump run for the whole 25 seconds.
Seems this isnt enough fuel? I read that you should get 500+ mls in 10 seconds?
Bad lift pump?
I can'tcan't find anyone with a tapped Banjo bolt locally, how have others jerry rigged a lift pump pressurre set up?
I went ahead, drained the fuel filter housing and put a 2 litre jug under the open drain hose.
Bumped the key and found that i got only about 600 mls of fuel letting the lift pump run for the whole 25 seconds.
Seems this isnt enough fuel? I read that you should get 500+ mls in 10 seconds?
Bad lift pump?
I can'tcan't find anyone with a tapped Banjo bolt locally, how have others jerry rigged a lift pump pressurre set up?
#6
This project has been on hold this winter. I even drove a F*rd most of the time.
I went ahead, drained the fuel filter housing and put a 2 litre jug under the open drain hose.
Bumped the key and found that i got only about 600 mls of fuel letting the lift pump run for the whole 25 seconds.
Seems this isnt enough fuel? I read that you should get 500+ mls in 10 seconds?
Bad lift pump?
I can'tcan't find anyone with a tapped Banjo bolt locally, how have others jerry rigged a lift pump pressurre set up?
I went ahead, drained the fuel filter housing and put a 2 litre jug under the open drain hose.
Bumped the key and found that i got only about 600 mls of fuel letting the lift pump run for the whole 25 seconds.
Seems this isnt enough fuel? I read that you should get 500+ mls in 10 seconds?
Bad lift pump?
I can'tcan't find anyone with a tapped Banjo bolt locally, how have others jerry rigged a lift pump pressurre set up?
#7
It's my pot and I'll stir it if I want to. If you're not careful, I'll stir your's as well!
On my truck there is quite a hefty steel elbow coming right off the CP3. I drilled and tapped that for a 1/8" fitting and tied my gauge into that. This has been working trouble free for many years.
If you feed a metal line directly into the cab then you may discover that this transmits noise. Two solutions that I discovered. Switch to a non-metallic line plus install a snubber right at the pump. Snubbers are very easy to make. The non-metallic line that I use is from Parker and is rated at 300 psi and is diesel proof. Of course you can also use an electric gauge and then just run some wires into the cab.
If you feed a metal line directly into the cab then you may discover that this transmits noise. Two solutions that I discovered. Switch to a non-metallic line plus install a snubber right at the pump. Snubbers are very easy to make. The non-metallic line that I use is from Parker and is rated at 300 psi and is diesel proof. Of course you can also use an electric gauge and then just run some wires into the cab.
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#8
I'm not looking to install a permanent gauge at this point, just rigging something up for diagnostics.
I had a setup thay i rigged up for checking my VP44 truck periodically but those are sumple because of the fitting on top of the filter housing.
I had a setup thay i rigged up for checking my VP44 truck periodically but those are sumple because of the fitting on top of the filter housing.
#9
Just to follow up on this in case someone else has this problem, yes you can test your FP from the filter drain. Just clamp a 1/3" ID onto the filter drain and attach your gauge.
I found that I had only 3 psi at idle and zero with any load.
I replaced the lift pump unit and I'm back to 15 psi at idle and 10 or so under load.
I found that I had only 3 psi at idle and zero with any load.
I replaced the lift pump unit and I'm back to 15 psi at idle and 10 or so under load.
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StealthDiesel (05-13-2017)
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