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So if I crank over right now (empty hpop) with my scanner watching icp psi. I can watch it build pressure from 0 to 100, 200, 300 all the way up to 500/600psi. If I check reservoir after doing this it will be full. (And I will double check this along with fuel pressure)
Could the check ball be the culprit?
Why would a cracked pickup tube cause problems with the hpop reservoir? I thought that only supplied the LPOP?
And bad LPOP means not enough oil/pressure to supply HPOP res? Keeping it starved?
Unfortunately works busy the rest of the week and a busy weekend coming up. Earliest I can perform these tests will be Monday evening after work. So bare with me if things slow down in this post...
First thing you want to do is fill the h-pop reservoir. Then try cranking in cycles, crank for about 15 to 20 seconds, let it rest, then crank again. Do this three times and if the engine is not trying to start check the h-pop res again . If it is low then you know you have a supply problem to the h-pop. If the h-pop res is still full then keep cranking in cycles as you need to work the air out of the system and hopefully it will start. As far as fuel pressure you can check it with a gauge that you know is good or just hook up a hose into a bucket and check the flow that way. Most importantly you want to fill the h-pop reservoir before you do anything and then check after cranking. At this point we can rule out the lpop and move on to why the reservoir is draining. Once the reservoir has drained you will always have a hard time getting the truck to start. Once there is air in the system it takes quite a bit of cranking to get the engine going and getting the air out. It is also very crucial to have good fully charged batteries when trying to do this, I'm not sure that a 2 amp battery charger will get your batteries fully charged for a process like this
First thing you want to do is fill the h-pop reservoir. Then try cranking in cycles, crank for about 15 to 20 seconds, let it rest, then crank again. Do this three times and if the engine is not trying to start check the h-pop res again . If it is low then you know you have a supply problem to the h-pop. If the h-pop res is still full then keep cranking in cycles as you need to work the air out of the system and hopefully it will start. As far as fuel pressure you can check it with a gauge that you know is good or just hook up a hose into a bucket and check the flow that way. Most importantly you want to fill the h-pop reservoir before you do anything and then check after cranking. At this point we can rule out the lpop and move on to why the reservoir is draining. Once the reservoir has drained you will always have a hard time getting the truck to start. Once there is air in the system it takes quite a bit of cranking to get the engine going and getting the air out. It is also very crucial to have good fully charged batteries when trying to do this, I'm not sure that a 2 amp battery charger will get your batteries fully charged for a process like this
I will use my shops big charger while trying this out.... the little one just keeps them topped off after a day of testing.
Should I test fuel pressure at the fuel bowl test ports? I have made some adapters to fit into those ports. Or is there another area to test at with a fuel pressure gauge?
pouring it out into a bucket will work but after all this work I need actual hard numbers, not a “yep that should do” hahaha
You can see in this picture where my sender is installed for my fuel pressure. This port is post filter and just on the passenger side of the drain valve. Speaking of filters have you changed yours?
You can see in this picture where my sender is installed for my fuel pressure. This port is post filter and just on the passenger side of the drain valve. Speaking of filters have you changed yours?
ok I will test the lower fuel bowl port then. Yes I have changed the fuel filter, I will add that to the OP
You could fill your HPOP reservoir with oil and leave it sit a while, then see if it's still full. That would eliminate the check ball or identify it as the problem, depending on the result.
You could fill your HPOP reservoir with oil and leave it sit a while, then see if it's still full. That would eliminate the check ball or identify it as the problem, depending on the result.
That's what I suggested for him to do last night but unfortunately he had already left the shop. Legalizechey, this would be a great thing to do before Monday when you start working on the truck. If you have time to go over to the truck one night fill up the hpop res and check it the next day or so that would be helpful. This way you can definitely verify what's going on beforehand. I think what probably happened is that your res was already empty when you started cranking the truck yesterday so depending on how many times you crank the truck it probably didn't have enough time to fill up the res and get to the injectors to build pressure. Whatever oil was put into the res yesterday from the lpop probably leaked back down overnight.
You could fill your HPOP reservoir with oil and leave it sit a while, then see if it's still full. That would eliminate the check ball or identify it as the problem, depending on the result.
Originally Posted by jstihl
That's what I suggested for him to do last night but unfortunately he had already left the shop. Legalizechey, this would be a great thing to do before Monday when you start working on the truck. If you have time to go over to the truck one night fill up the hpop res and check it the next day or so that would be helpful. This way you can definitely verify what's going on beforehand. I think what probably happened is that your res was already empty when you started cranking the truck yesterday so depending on how many times you crank the truck it probably didn't have enough time to fill up the res and get to the injectors to build pressure. Whatever oil was put into the res yesterday from the lpop probably leaked back down overnight.
I will do this on Friday, just don’t have enough to time to play with multiple tests tomorrow. Filling on Friday and checking Monday morning should be a good indicator or too much time?
I will do this on Friday, just don’t have enough to time to play with multiple tests tomorrow. Filling on Friday and checking Monday morning should be a good indicator or too much time?
That would be fine. Also on Monday if you can give the engine a once over for external leaks, especially in the valley that would be good. Have you noticed any oil leaks lately as you were working on the truck?
That would be fine. Also on Monday if you can give the engine a once over for external leaks, especially in the valley that would be good. Have you noticed any oil leaks lately as you were working on the truck?
it had a small power steering leak and the a-typical oring leak around the dipstick tube adapter. Other than that nothing. I have the intake off at the moment so I can take a look no problem. It’s pretty dirty in the valley, but no fresh wet puddles or leaks that I see.
it had a small power steering leak and the a-typical oring leak around the dipstick tube adapter. Other than that nothing. I have the intake off at the moment so I can take a look no problem. It’s pretty dirty in the valley, but no fresh wet puddles or leaks that I see.
Sounds good, there are several leak points on the hpop that can leak externally so just wanted to be sure
Hello everyone, I have returned with an answer on the hpop res leaking. It does indeed leak.
I used a file to make the notches on the 3/16” Allen wrench. The bottom one is an inch from the bottom of the wrenches elbow....
Friday, I filled the reservoir in between the second and third notch. This morning, I checked it and over the weekend, we’ve lost 1/2 an inch of oil
As you saw from my thread, I'm suspecting the same issue. I'll have to go back and read your symnptoms. My valley did have wet/damp areas when I worked on it the other week, but I assumed that it was fuel and/or from the leaking CCV o-rings. Assumed that I fixed it, but now I'm wandering if I actually did.
Good idea on the homemade dipstick. I might have to copy that in a few days.
I am curious to hear from those who know, if that is an acceptable drop in oil level or not. Off the cuff, it doesn't sound too bad for that period of time.
