Mechanical fuel pump as a scavenger for an electric? plus other questions (1 Viewer)

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nat

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With my big 49 gallon fuel tank, it is impossible to mount my fuel pump below the level of the tank.

Can I use the mechanical pump on my SBC 350 to feed my electric? seems like it is okay so long as the flow is there.

Which inline pump is the best? I have read the threads and looked online, I would like an Edlebrock quietflow, but it is $600 on Summit.

If I get a higher pressure electric pump, can I use a regulator with a return line? Are there any good 15 PSI pumps?

This is for TBI. Thanks:cheers:
 
So why would a mechanical pump pull fuel and an electrical one supposedly not?



There are many electrical and mechanical fuel pumps used on a variety of equipment where they are not mounted below the tank, but rather, many feet higher than the fuel pickup in the tank.




:beer:
 
So why would a mechanical pump pull fuel and an electrical one supposedly not?



There are many electrical and mechanical fuel pumps used on a variety of equipment where they are not mounted below the tank, but rather, many feet higher than the fuel pickup in the tank.




:beer:

Because gear pumps are almost as bad as piston pumps for pulling a vacuum whereas diaghphram pumps aren't hurt by running dry and pull a larger vacuum per stroke.
 
So why would a mechanical pump pull fuel and an electrical one supposedly not?



There are many electrical and mechanical fuel pumps used on a variety of equipment where they are not mounted below the tank, but rather, many feet higher than the fuel pickup in the tank.




:beer:

I had always heard an electric fuel pump needed to be mounted below the level of the fuel tank. Right now I am using one very noisy electric pump. It gives me 11 psi and it is mounted about mid tank level. So far my only real issue is noise and pressure, however a couple times with only 5-6 gallons left the motor about cut out on the freeway............it definitely seemed like fuel starvation.
 
I was worried about starving my expensive electric pump also so I built a simple surge tank

I have been using a NAPA low pressure (for carbs) electric pump to keep it full. I was having problems with not maintaining pressure. I think it is because the NAPA pump can't provide the volume, so I am right now replacing it with a mechanical since my TBI block is machined for it. Stock GM pump delivers plenty of volume but only about 6 psi.

My TBI pump is a Walbro from Auto Performance Engineering, model GSL395. I can hear it prime itself but I can't hear it at all with the engine idling. Walbro has excellent specs and reputation.

Can't comment on how well this will work until next week, but I consider the surge tank a necessity since EFI pumps overheat quickly when you run them dry (so I've heard). This setup worked great for the first year or so. I just recently noticed the pressure problem and am in the middle of troubleshooting it. HTH
 

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