Re: fuel pump
Posted by HH56 On 2015/5/22 9:32:57
O_D brings up a good point about failure. There are multitudes of mechanical pumps in use and longevity has not been an issue -- unless the pumps you have been installing have been sitting a long time and have old rubber diaphragms that had dried or was not alcohol resistant. Modern gas with ethanol and additives will typically finish those off in a short time. There are several rebuild kits and places available that use alcohol resistant rubber. I would not buy a NOS kit or any kit that does not state it uses fresh or modern type rubber parts.
If you do want to go completely electric there are some PAC regions that sell electric pumps. If you want to support them and have access to PACs News Bulletin, there are some ads listing where they are available. If you want to go to a local parts store or order thru Amazon, then Airtex is an established brand of pump with universal pump offings that many use in their cars.
The original Packard pump specs had 3 1/2 to 5 1/2 psi output. If you are going to totally replace your mechanical pump then the Airtex E8004 would be my choice. The pressure is correct as is the fuel line size and a rollervane pump would be relatively quiet.
If you are going to keep the mechanical pump and, as most do add the electric in the line somewhere near the tank to use only for priming or as a backup then the E8004 pump would not be a good choice. The rollervane (and also rotary vane) pump construction will typically not let a mechanical pump pull fuel thru. If keeping the mechanical in the line then you will have to choose one of the solenoid types or else get really elaborate with the plumbing with check valves etc to provide a way around the electric.
Here are Airtex offerings with the right psi range and line size. Neither solenoid type is perfect so it depends on which is most easily available and how you want to approach the install. The 5-9 psi pump output pressure is a bit high so it may need an additional pressure regulator after the pump to avoid potential flooding problems. That would depend on how restrictive to flow pushing fuel thru the mechanical pump and filter might be. The 2.5 to 4.5 psi pump is a bit low and with filters and restrictions before the carb, its output pressure may not be sufficient to give adequate flow at higher engine speeds. Some are using it though and seem to have no issues. Of the two I would choose the E8012S, install near the tank and make contingency plans for installation of a regulator nearby if it proved to be needed.
On any electric pump install it would probably be a good idea to also add a large capacity easily changeable filter between the tank and pump. Any rust or debris in the tank could be eliminated before it hit the pump or clog the tiny filter that might come with the pump.
Attach file:
(16.90 KB)
(34.93 KB)
If you do want to go completely electric there are some PAC regions that sell electric pumps. If you want to support them and have access to PACs News Bulletin, there are some ads listing where they are available. If you want to go to a local parts store or order thru Amazon, then Airtex is an established brand of pump with universal pump offings that many use in their cars.
The original Packard pump specs had 3 1/2 to 5 1/2 psi output. If you are going to totally replace your mechanical pump then the Airtex E8004 would be my choice. The pressure is correct as is the fuel line size and a rollervane pump would be relatively quiet.
If you are going to keep the mechanical pump and, as most do add the electric in the line somewhere near the tank to use only for priming or as a backup then the E8004 pump would not be a good choice. The rollervane (and also rotary vane) pump construction will typically not let a mechanical pump pull fuel thru. If keeping the mechanical in the line then you will have to choose one of the solenoid types or else get really elaborate with the plumbing with check valves etc to provide a way around the electric.
Here are Airtex offerings with the right psi range and line size. Neither solenoid type is perfect so it depends on which is most easily available and how you want to approach the install. The 5-9 psi pump output pressure is a bit high so it may need an additional pressure regulator after the pump to avoid potential flooding problems. That would depend on how restrictive to flow pushing fuel thru the mechanical pump and filter might be. The 2.5 to 4.5 psi pump is a bit low and with filters and restrictions before the carb, its output pressure may not be sufficient to give adequate flow at higher engine speeds. Some are using it though and seem to have no issues. Of the two I would choose the E8012S, install near the tank and make contingency plans for installation of a regulator nearby if it proved to be needed.
On any electric pump install it would probably be a good idea to also add a large capacity easily changeable filter between the tank and pump. Any rust or debris in the tank could be eliminated before it hit the pump or clog the tiny filter that might come with the pump.
Attach file:
(16.90 KB)
(34.93 KB)
This Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=162194