HPOP Check Valves
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Laughing Gas
Joined: Dec 2007
Posts: 1,052
Likes: 2
From: Alvarado, TX
HPOP Check Valves
I recently replaced the high pressure oil lines and fittings on my '02 a typical aftermarket kit that uses JIC fittings. This requires removing the check valves from the pump since the fittings aren't machined for the springs. I read several posts on different sites where people said they had no bad effects from pulling the check valves but now it takes a solid 10 seconds of cranking to fire the engine, even immediately after shutting it off. Does anyone here have any experience with removing the check valves or any thoughts on any other causes of the hard starting?
It's a Van Gogh
Joined: Feb 2010
Posts: 7,812
Likes: 1,335
From: Elk Grove, CA
I do not think removing the check valves from the HPOP will cause that hard start. Pretty sure. Prolly. I guess.
Before trying to start pull the allen head plug from atop the HPOP reservoir. The oil level should be about 3/4 inch from the top. If lower than that the engine needs to crank to fill that volume before oil is available to fire the injectors.
Before trying to start pull the allen head plug from atop the HPOP reservoir. The oil level should be about 3/4 inch from the top. If lower than that the engine needs to crank to fill that volume before oil is available to fire the injectors.
Cargo Master
Joined: Sep 2015
Posts: 2,860
Likes: 365
How long have you run the truck since changing the hpop lines? You might still have some are in the lines as it takes a while to purge the air out. Removing the check valves will not cause hard starting, You might find that it takes one or two seconds longer to start but not what you are describing
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Agree with all of the above and recommend hooking up a scan device to monitor ICP and IPR DC% while starting. If you don't already have a scan tool then would suggest checking out the tech section in the stickies and read through the info about Forscan. It is the best and most affordable option we have for these trucks hands down.
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,352
Likes: 5,946
From: Lake Hartwell, GA
I recently replaced the high pressure oil lines and fittings on my '02 a typical aftermarket kit that uses JIC fittings. This requires removing the check valves from the pump since the fittings aren't machined for the springs. I read several posts on different sites where people said they had no bad effects from pulling the check valves but now it takes a solid 10 seconds of cranking to fire the engine, even immediately after shutting it off. Does anyone here have any experience with removing the check valves or any thoughts on any other causes of the hard starting?
You did right by coming here and asking the question flat out as the other posts on "different sites" were steering you wrong. If you are referring to Facebook groups, you have to be very careful with any information you glean from there. It is riddled with false and fraudulent claims.
Don't take my word for it though, hear for yourself in the video below. This is my truck starting after sitting for 2 weeks and then after sitting for a few minutes after I ran into the store.
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,352
Likes: 5,946
From: Lake Hartwell, GA
In addition and to piggyback on what the other fellas have written above...
FORScanCheck out the link above for an ideal scan tool setup that Udsuth78 was referring to and the 7.3L PSD Tech Folder is a wealth of information.
FORScanCheck out the link above for an ideal scan tool setup that Udsuth78 was referring to and the 7.3L PSD Tech Folder is a wealth of information.
Logistics Pro
Joined: May 2017
Posts: 4,667
Likes: 1,455
From: Muskogee, Ok
Hype. Maybe a half second delay after removal, could be the rest of the work done at that time tho. Went from split shots to single shots. Nothing to be overly concerned about
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FTE Chapter Leader
Joined: May 2020
Posts: 2,933
Likes: 2,192
From: Langley B.C. Canada
Over 2 years now on the jic with check valve’s removed.
Nothing as a noticeable difference in cranking time to it flashing up.
T6 oil did make a difference, longer cranking time during summer heat. Enough for me to notice, not enough to be concerned. Definitely flashes quicker during winter months.
Anything else you did while replacing the HPOP lines that could be a contributing factor?
Nothing as a noticeable difference in cranking time to it flashing up.
T6 oil did make a difference, longer cranking time during summer heat. Enough for me to notice, not enough to be concerned. Definitely flashes quicker during winter months.
Anything else you did while replacing the HPOP lines that could be a contributing factor?
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Laughing Gas
Joined: Dec 2007
Posts: 1,052
Likes: 2
From: Alvarado, TX
Thanks for all the responses. I'm sorry I didn't get a chance to look at them earlier but I've been working goofy hours lately. My info certainly did not come from Facebook since I've never been on it. Just a couple of diesel specific sites that said the same thing as y'all- pulling the check valves doesn't cause hard starting. I haven't driven it more than a few miles yet because I have a list of projects to do on it so I'll give it some more time and read up on your suggestions. I appreciate all the help.
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Laughing Gas
Joined: Dec 2007
Posts: 1,052
Likes: 2
From: Alvarado, TX
Thanks for all the responses. I'm sorry I didn't get a chance to look at them earlier but I've been working goofy hours lately. My info certainly did not come from Facebook since I've never been on it. Just a couple of diesel specific sites that said the same thing as y'all- pulling the check valves doesn't cause hard starting. I haven't driven it more than a few miles yet because I have a list of projects to do on it so I'll give it some more time and read up on your suggestions. I appreciate all the help.
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Laughing Gas
Joined: Dec 2007
Posts: 1,052
Likes: 2
From: Alvarado, TX
I definitely will but it will be a minute before I can. Just pulled the bed off this morning before work to get to another project on it. Thanks again.
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