fuel pump

[W Head]

I ordered a new fuel pump from Bruce at Show Cars. The site said the 4278A is for all 348 and 409 engines. It came in yesterday and it has a fitting for a return line. Do you just block this off? Show Cars is closed today or I would call. It is for the 409 in my 59 Impala.

W Head

59 Impala 409-2,4s

 

[Don Jacks]

Yes,just block it off.Be sure to check the out put pressure.A lot of the replacement stuff has been crazy high with their pressures lately.

 

[DIV1RACER-2]

That is not a return line , it is a vent for the diaphram ... When used in a Marine application it needs to be vented to the air intake .. combining part numbers and that is the result ... The reason i know this , was the one i bought had an explanation in the package !!!

 

[La Hot Rods]

Where does the return fitting come from on the pump?

 

[NCPOP]

Yes,just block it off.Be sure to check the out put pressure.A lot of the replacement stuff has been crazy high with their pressures lately.

Thats very true I have a new Carter that pushes 12psi.

 

[DIV1RACER-2]

The return line on the 63-64 cars come off of the fuel filter...

 

[63impalass409]

I would send it back and get the correct one but that's just me with my ocd

 

[DaveN]

return line is 5/16th line routed from the fuel filter 3 hole down the back to the bell in chrome them small hose and steel line back to the tank and connected to the fuel sending unit. correct pump does not have a vent.

 

[DaveN]

If you can just get a used correct pump and buy a rebuild kit it's not hard to do just take your time.

 

[Michelangelo]

^^ Yep, putting a diaphragm kit in a pump is certainly not a big deal. Back in the 60-70's we didn't automatically buy new fuel pumps, we just put diaphragm kits in them. Might have been (Bowman?) sold the chevy kits for $1.95 for years. Ahh, the good 'ol days.

 

[GCAMINO]

A lot of the after market pumps seem to have the vent fitting. The pressure went too high when blocking it off. I had that on my 56, and just left it open.

 

[32witha409]

A lot of the after market pumps seem to have the vent fitting. The pressure went too high when blocking it off. I had that on my 56, and just left it open.

The back side of the diaphragm must be vented to atmo. Blocking the vent nipple is a no no.