Need help with pressure problem
Thread Starter
Staging Lane
Joined: Dec 2016
Posts: 62
Likes: 0
You'd think so. I primed it with 4 quarts through the access hole on the drivers side front. Put the plug back in and then started it. It had 20lbs for about 5-10 seconds then tapered off to zero.
I picked up the O ring for the LQ4 engine (red) from the local parts store and it does seem to be a bit thicker. I'll change it out Friday and will take a picture of the 2 side by side. It did seem strange how it went in, there was hardly any resistance when I put the tube back into the pump. I pulled it out and reinstalled it a few times because I thought it wasn't right. I would rather replace the cheap O ring than just jump in and replace the pump.
I picked up the O ring for the LQ4 engine (red) from the local parts store and it does seem to be a bit thicker. I'll change it out Friday and will take a picture of the 2 side by side. It did seem strange how it went in, there was hardly any resistance when I put the tube back into the pump. I pulled it out and reinstalled it a few times because I thought it wasn't right. I would rather replace the cheap O ring than just jump in and replace the pump.
Ah - that's more conclusive than your original post. Something's clearly amiss. FWIW my ring was snug on the tube and VERY snug in the block. Had to lube the hell out of it and rock it a bit one hand while tightening the single bolt with other to get the flange to pull up evenly.
One tip I can give is to take the pump cover off, fill it with heavy gear oil or STP oil treatment or pack it with grease. That will assist in sealing and help with the suction during the first start up.
Some may have issues with doing this, but I have successfully done this without any issues, Oil can be changed one it is up and running ok.
BC
Some may have issues with doing this, but I have successfully done this without any issues, Oil can be changed one it is up and running ok.
BC
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Feel your pain - I think I had mine in/out 11 times. The last one because I got a flawed aftermarket oil pan that had a casting flaw in oil filter passages which caused an external leak once I tried to prime it with pressurized oil. Thinking I was an hour away from a first start when I notice the growing puddle of oil on the garage floor.
You'll figure it out - hang in there.
You'll figure it out - hang in there.
TECH Fanatic
Joined: Jun 2014
Posts: 1,533
Likes: 12
Are you sure it's the right pick up tube? When my motor sat for a while , it took forever to prime with a garden sprayer connected to the plug on right front. I would keep priming it until you see oil come out of the rockers.
Thread Starter
Staging Lane
Joined: Dec 2016
Posts: 62
Likes: 0
Not true on mine Michael. If I change the pickup tube back to the original one it won't reach down far enough into the pan and might not even fit in the pan correctly. I had to put a truck pan on it to clear my front cross member. Truck pans hold an extra quart and place the pickup in a different spot.
I pulled my engine back out this morning. It is on the stand right now and when I pulled the pan off it seems the flange did not pull up to the bottom of the pump, it was about an 1/8 high on the side with no bolt ( seems like if they drilled and taped 2 bolt hols around the tube they should have made a flange with 2 bolt holes instead of 1). Anyway I pulled the tube back off and put another fresh o ring on it, lots of grease and it slid in nice and snug. Once the bolt was tightened up the flange is nice and flush all the way around.
I pulled my engine back out this morning. It is on the stand right now and when I pulled the pan off it seems the flange did not pull up to the bottom of the pump, it was about an 1/8 high on the side with no bolt ( seems like if they drilled and taped 2 bolt hols around the tube they should have made a flange with 2 bolt holes instead of 1). Anyway I pulled the tube back off and put another fresh o ring on it, lots of grease and it slid in nice and snug. Once the bolt was tightened up the flange is nice and flush all the way around.
You're taking my reply a bit too literally - LOL! I was simply referring to the end of the tube in question here. Of course you have to use the tube that fits your oil pan on the other end. I know EXACTLY what mean about proper flange fitment.....and I had the same thought about "why not use both threaded holes?"
At least now you'll know this piece is correct. You could use starter/battery and some long jumper wires to turn it over and check for pressure before you go back in with it. Could even easily pull plugs to make it easier on batt/starter and to get more rpm.
At least now you'll know this piece is correct. You could use starter/battery and some long jumper wires to turn it over and check for pressure before you go back in with it. Could even easily pull plugs to make it easier on batt/starter and to get more rpm.
Thread Starter
Staging Lane
Joined: Dec 2016
Posts: 62
Likes: 0
Not to literally,just havin some fun with you
. I was thinking of the jumper cable route myself. For now I have it on it's side and pored oil into the side plug to see if it would leak past the flange. So far it's been an hour and nothing dripping yet. I definitely want this to be the last time it goes in.
. I was thinking of the jumper cable route myself. For now I have it on it's side and pored oil into the side plug to see if it would leak past the flange. So far it's been an hour and nothing dripping yet. I definitely want this to be the last time it goes in. 
Cody - my thinking is that IF it turns out that the issue ISN'T the o-ring, I'd still want the motor out of the van on the stand to trouble shoot other things. Hence the 'spin it up with starter on the stand' thought...
Thread Starter
Staging Lane
Joined: Dec 2016
Posts: 62
Likes: 0
I primed it this morning with 8 quarts of oil from my home made priming rig. Then hooked jumpers to the starter. I had nothing for the first few seconds and thought here we go again. Then the needle started to move slowly at first then jumped right up to about 60lbs. Then I did my happy dance. Thanks Michael and everyone for the help and guidance.
