HELP.....Fuel Pump Question??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

novajess1972 · 11-30-2006, 02:09 PM

This is simple, I'm sure, but I didn't remove the lines, so now I have no reference of what goes where

Anyway, I have your standard mechanical fuel pump that was already attached to the BB I just dropped in. I know that the nozzle (or whatever it may be called) facing toward the front is the one that shoudl run to the carb...or from the carb. However, there is another nozzle on the underside of the F/P and then a hole with threads on the backside of the F/P, facing rearward. What are the underside fitting end and rear side threaded hole for? I'm sure that one is the return, but which one? Then what's the purpose of the other??

HELP!!!!!!

bryanw1968 · 11-30-2006, 06:45 PM

Pic?

piecesparts · 11-30-2006, 07:10 PM

Most of the pumps that I have seen have the discharge to the carb on the front side. The inlet is a square block on the bottom of the pump (also facing front wards on the pump bottom. The return is a smaller line (usually a tube with a bulb on the end and real small orifice in it) on the bottom. The real small hole limits the fuel amount returning to the tank and it ensures there is enough going to the carb.

novajess1972 · 12-01-2006, 08:59 AM

Quote:

Originally Posted by bryanw1968

Pic?

Sorry, I would have to remove the F/P to get a good pic. And I hate reinstalling them and trying to move that pin inside block while doing so. Call me lazy...

Jesse

11-30-2006, 02:09 PM	#1
novajess1972 Registered User Join Date: Sep 2006 Location: Houston, Texas Posts: 190	HELP.....Fuel Pump Question??? This is simple, I'm sure, but I didn't remove the lines, so now I have no reference of what goes where Anyway, I have your standard mechanical fuel pump that was already attached to the BB I just dropped in. I know that the nozzle (or whatever it may be called) facing toward the front is the one that shoudl run to the carb...or from the carb. However, there is another nozzle on the underside of the F/P and then a hole with threads on the backside of the F/P, facing rearward. What are the underside fitting end and rear side threaded hole for? I'm sure that one is the return, but which one? Then what's the purpose of the other?? HELP!!!!!! __________________ 1985 SWB Silverado 1/2 Ton 1972 Chevy SWB 1/2 Ton (sold) 1972 Chevy Chevelle SS (sold) 1971 Chevy Nova (sold) 1967 Chevy El Camino (sold) 2001 Mustang Bullitt (sold) 2019 Toyota Tundra Crewmax (daily)

11-30-2006, 06:45 PM	#2
bryanw1968 Senior Member Join Date: Jul 2006 Location: Leander, Texas Posts: 850	Re: HELP.....Fuel Pump Question??? Pic?

11-30-2006, 07:10 PM	#3
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: HELP.....Fuel Pump Question??? Most of the pumps that I have seen have the discharge to the carb on the front side. The inlet is a square block on the bottom of the pump (also facing front wards on the pump bottom. The return is a smaller line (usually a tube with a bulb on the end and real small orifice in it) on the bottom. The real small hole limits the fuel amount returning to the tank and it ensures there is enough going to the carb.



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