TBI fuel pump, can fuel be drawn thru it unpowered?

[kilohertz]

Hi guys,

Mounting a new fuel tank and pump in my 49 F-47 truck and want to know if I can draw fuel thru an un-powered in tank TBI pump for the carb until I get the TBI system built. The tank and pump are from an early 90's GM van. Will a mechanical pump for a carb be able to draw gas thru the pump?

Thanks

[1project2many]

This doesn't usually work well. There is usually too much restriction in the flow path for the mechanical pump to supply enough fuel. YMMV.

[kilohertz]

Okay, thx for the reply. My box is off now so I can at least try it, if it doesn't work I can remove the pump and just put a drop tube in for now...still sourcing parts for my TBI setup.

cheers

[1project2many]

Would it make sense to wire in the electric pump now and use it to feed the carb?

[kilohertz]

Would it make sense to wire in the electric pump now and use it to feed the carb?

It would, except the pump puts out 25PSI and then I would need to buy a regulator and mount it somewhere. Carb needs about 3-5 PSI.

Cheers

[ras"86]

I do use an electric pump (low pressure )to push through the mechanical.

[1project2many]

It would, except the pump puts out 25PSI and then I would need to buy a regulator and mount it somewhere. Carb needs about 3-5 PSI.

Cheers

Understood. The price of an aftermarket regulator can be quite high.

[stew86MCSS396]

Don't know the exact specifics but a friend of mine on his late '80s C4 TPI converted to carb...used the stock in tank fuel pump. At the carb end, all he did was run a t-fitting with a nitrous pill stuffed in the rubber hose that goes to the return line. I asked what size and was told "trade secret." :rolleye:

[tayto]

Understood. The price of an aftermarket regulator can be quite high.
$50 for quick fuel regulator $60 for holley regulator on amazon. prices in canadian dollars.....