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As a means for installing a cheap and easy sump, could I install something like this under my tank (gravity feeding from the stock tank) with a return line to the top of the tank (to bleed air from the auxillary tank taken in on cornering with low fuel in main tank) and use an inline pump and regulator from this auxillary tank to an efi setup?
that small tank more than likely has a vented cap so you would need to solve that one first I think it may work as you describe. To gravity flow to a tank that you are pulling out of with a pump you may need a fairly large supply line to the second tank.
I installed a sump that the diesel guys are using, bolts to the tank without welding. I also purchased a couple fuel tank fittings that secure with Teflon washers and a nut. The fittings have rounded inlets for better fuel flow. I ended up installing the sump and didn't use the fuel tank fittings so I don't have first hand knowledge on the install.
So long as we're talking about using a sump here, is it necessary to run a line from the center of the tank or would it be okay to take it off one of the sides? Id like to try and manage to retain my spare
Yes, the concept will work, but as noted you'll need a large line to gravity feed the tank. No reason you couldn't take the fittings off one side, or both sides for that matter, instead of the middle. Going from one side would reduce the effectiveness or possibly cause starvation in long sweeping corners turning to that side. The effectiveness and how long you can run without taking more fuel from the main tank really depends on your surge tank size.
Have you thought about using the mechanical pump to feed the surge tank?
Yes, the concept will work, but as noted you'll need a large line to gravity feed the tank. No reason you couldn't take the fittings off one side, or both sides for that matter, instead of the middle. Going from one side would reduce the effectiveness or possibly cause starvation in long sweeping corners turning to that side. The effectiveness and how long you can run without taking more fuel from the main tank really depends on your surge tank size.
Have you thought about using the mechanical pump to feed the surge tank?
The idea had not crossed my mind really, then I wouldn't have to drop the tank or make any holes in it!
Also if you did feed the sump by the mechanical pump would you use two(or even 3)returns to the main tank (one from mech pump, one from sump and possibly another yet from the electric pump?)
Whatever you're doing to make the link doesn't work. Are you logged on when you copy it?
You use the return line from the mechanical pump. I believe you could just T into it or you could plug the outlet at the pump and re-route the line to the to of the surge tank. The return from the EFI system goes to the surge tank otherwise the electric pump would empty the surge tank.
Yes, if you kill power to the pump the engine won't run.
Whatever you're doing to make the link doesn't work. Are you logged on when you copy it?
You use the return line from the mechanical pump. I believe you could just T into it or you could plug the outlet at the pump and re-route the line to the to of the surge tank. The return from the EFI system goes to the surge tank otherwise the electric pump would empty the surge tank.
Yes, if you kill power to the pump the engine won't run.
Like this (where fuel return from engine is from the electric pump?
I little research tells me you have a 78.
You realize the 78 fuel tank is actually a plastic tank within the steel enclosure(not a rubber bladder but a hard plastic tank).
To be adding any kind of sump or fittings you may need to get a replacement tank that doesn't have the inner tank.
You put a Bosch 044 type pump right into the hole.
Put a decent barrier between the fuel system and you and your passenger if you put it into the jack compartment. You don't want an incident or accident catching the car on fire right behind you or spraying fuel over you.
If you have a 78, then you could just put the 82 sender into the tank with a high pressure pump.
Last edited by lionelhutz; 12-06-2016 at 12:53 PM.
You put a Bosch 044 type pump right into the hole.
Put a decent barrier between the fuel system and you and your passenger if you put it into the jack compartment. You don't want an incident or accident catching the car on fire right behind you or spraying fuel over you.
If you have a 78, then you could just put the 82 sender into the tank with a high pressure pump.
If I used an 82 sender I still wouldn't have a sump to avoid cavitation of the pump and stalling of the engine though...or am I missing something?
also as far as safety/mounting the tank in the jack compartment, if I use an inline pump down stream, the sump would never see high pressure fuel which should eliminate most the danger no? (trucks up to the 70s had cab mounted tanks behind the bench)...unless there were a leak where the battery ignited some fumes seems unlikely
also as far as safety/mounting the tank in the jack compartment, if I use an inline pump down stream, the sump would never see high pressure fuel which should eliminate most the danger no? (trucks up to the 70s had cab mounted tanks behind the bench)...unless there were a leak where the battery ignited some fumes seems unlikely
Doesn't really take ANY pressure for gas fumes to be present....and it just so happens you have some rubber lines that ethanol in the gas can permeate....especially on a nice hot day...
AND in the same small compartment that's really not vented- is a battery? Imagine if the terminal is loose when you try to start the car...
09-29-2016, 12:09 PM
Cheap Sump?
