Explorer PS pump

[hunter1]

Will the explorer PS pump pull oil once primed from the tank or does the tank need to gravity feed to the pump?

 

[Viperwolf1]

It has to gravity feed. No way to get air out of the system if the tank is below the pump.

 

[ksagis]

It has to gravity feed. No way to get air out of the system if the tank is below the pump.

Is there a nuance to this actually, I’ve seen a few posts saying similarly, maybe also from @nvrstuk in other posts on the same topic.

Seems to me as long as the top of the fluid in the reservoir is above the inlet of the pump that it would be okay since that would produce a positive static head? No clear to me how much static head is needed to ensure proper fluid flow and not cavitating the pump tho.

Would love to hear whats wrong in my logic.

 

[73azbronco]

I was going to use some version of an e250/350 PS res on the fender, would also allow hydroboost plumbing. I elected to go spam in can to solve the issue.

 

[hunter1]

I was going to use some version of an e250/350 PS res on the fender, would also allow hydroboost plumbing. I elected to go spam in can to solve the issue.

I had actually bought the same 250 resevoir but couldn’t find a suitable place to mount it.

 

[hunter1]

Is there a nuance to this actually, I’ve seen a few posts saying similarly, maybe also from @nvrstuk in other posts on the same topic.

Seems to me as long as the top of the fluid in the reservoir is above the inlet of the pump that it would be okay since that would produce a positive static head? No clear to me how much static head is needed to ensure proper fluid flow and not cavitating the pump tho.

Would love to hear whats wrong in my logic.

My outlet from the can is actually above the pump inlet but I cannot rotate the pump fitting anymore to eliminate the raised bump in the hose. As long as the hood will fit, I think there would be enough head to keep the pump fed. Also, there is not a breather in the reservoir which may slightly create a small positive pressure from the return oil aiding in a charge effect to the pump.

 

[Yeller]

Positive pressure is how we get some of the high flow systems to not cavitate.

 

[nvrstuk]

Is there a nuance to this actually, I’ve seen a few posts saying similarly, maybe also from @nvrstuk in other posts on the same topic.

Seems to me as long as the top of the fluid in the reservoir is above the inlet of the pump that it would be okay since that would produce a positive static head? No clear to me how much static head is needed to ensure proper fluid flow and not cavitating the pump tho.

Would love to hear whats wrong in my logi

Seems to make sense however, you have to remember we go up hills, down hills, and side hilling.

Physics proves when you are climbing a rock wall how your ps pump won't work at all when the reservoir is mounted on the firewall updateunless it's high enough or the pump is low enough) or on the side fender when leaning to the other side. Nobody figures friction losses when thinking that atmospheric pressure and fluid levels being equal will work for ps systems... isn't that simple in this situation. As soon as you get an air bubble in the feed line you will have difficulty moving the fluid in the reservoir to the pump. Same as a water pump, get a loop in the suction hose and good luck drawing water up thru the hose to the pump.

 

[ksagis]

Seems to make sense however, you have to remember we go up hills, down hills, and side hilling.

Physics proves when you are climbing a rock wall how your ps pump won't work at all when the reservoir is mounted on the firewall updateunless it's high enough or the pump is low enough) or on the side fender when leaning to the other side. Nobody figures friction losses when thinking that atmospheric pressure and fluid levels being equal will work for ps systems... isn't that simple in this situation. As soon as you get an air bubble in the feed line you will have difficulty moving the fluid in the reservoir to the pump. Same as a water pump, get a loop in the suction hose and good luck drawing water up thru the hose to the pump.

Makes sense, hose ID also important to keep fluid velocity and friction losses low. Appreciate the added thoughts.

 

[hunter1]

Ok, was able to shorten the hose some and get the “bump” out f it. About level with the pump inlet now, but tank is still not any higher. I think it will work fine with the head that it will have now. I’m still a few days from starting it and bleeding everything but will keep you posted.