ASAP mechanical fuel pump inlet - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*vegaschevy* · 09-30-2009, 08:40 PM

I have fuel to my fuel pump but the engine is not getting fuel. I am wondering if the inlet and outlet of the fuel pump lines were switched.

Can anyone tell me which nipple the fuel inlet line comes in on?

looking at it from the top down or from the bottom.... PLEASE!!! trying to work during daylight hours...a

**FRENCHBLUE72** · 09-30-2009, 08:45 PM

With the pump mounted on the motor the one closest to the block goes to carb the othe goes to the fuel supply line..

*vegaschevy* · 09-30-2009, 09:07 PM

I have a 3 line pump on the truck. Im guessing it is a return line for some reason on the third one. Can I run a 2 line fuel pump instead?

stueber68 · 09-30-2009, 10:15 PM

The return nipple should be a smaller diameter if I remember correctly.

*2tons of fun* · 10-01-2009, 11:28 PM

5/16 barb is the inlet for the pump
1/4 barb is the return line to the tank.

5/16 i/f is the outlet to the carb.

Longhorn Man · 10-02-2009, 12:13 AM

if its an inline or 2 bbl small block it'll be 5/16ths, a v6, 4 bbl small block or any big block will be 3/8ths

09-30-2009, 08:40 PM	#1
vegaschevy Account Suspended Join Date: May 2009 Location: las vegas nv Posts: 1,493	ASAP mechanical fuel pump inlet I have fuel to my fuel pump but the engine is not getting fuel. I am wondering if the inlet and outlet of the fuel pump lines were switched. Can anyone tell me which nipple the fuel inlet line comes in on? looking at it from the top down or from the bottom.... PLEASE!!! trying to work during daylight hours...a

09-30-2009, 08:45 PM	#2
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,594	Re: ASAP mechanical fuel pump inlet With the pump mounted on the motor the one closest to the block goes to carb the othe goes to the fuel supply line.. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

09-30-2009, 09:07 PM	#3
vegaschevy Account Suspended Join Date: May 2009 Location: las vegas nv Posts: 1,493	Re: ASAP mechanical fuel pump inlet I have a 3 line pump on the truck. Im guessing it is a return line for some reason on the third one. Can I run a 2 line fuel pump instead?

09-30-2009, 10:15 PM	#4
stueber68 1968 C20 Vortec Beast Join Date: Jun 2005 Location: STILLWATER,OKLAHOMA Posts: 483	Re: ASAP mechanical fuel pump inlet The return nipple should be a smaller diameter if I remember correctly. __________________ Ugly or not it still kicks a**!

10-01-2009, 11:28 PM	#5
2tons of fun Account Suspended Join Date: Jan 2009 Location: galt ca, Posts: 749	Re: ASAP mechanical fuel pump inlet 5/16 barb is the inlet for the pump 1/4 barb is the return line to the tank. 5/16 i/f is the outlet to the carb.

10-02-2009, 12:13 AM	#6
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: ASAP mechanical fuel pump inlet if its an inline or 2 bbl small block it'll be 5/16ths, a v6, 4 bbl small block or any big block will be 3/8ths



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