Background info: I currently have an '85 LG4 with all emissions, etc. I just got an L05 that I intend to put in toward the end of the month (keeping all emissions). I ordered it early to make sure I had all the parts, and I found out that it has no provisions for a mechanical fuel pump (I can post a pic). I'm going to have to change to an electric fuel pump, and also my car does not have an in-tank pump.

Question: It appears that none of the aftermarket electric fuel pumps have an outlet for a return line, but I'd like to keep it. Does anyone have any ideas for the return line other than capping it off or buying a $75+ pressure regulator with several outlet ports? Also, does anyone have suggestions for a good pump set-up (without dropping the tank)? I noticed that both Holley and Carter make a pump that outputs about 4.5-6 psi, but I could also use a Holley blue pump with its regulator.

 

Most of the holley pumps come with a regualtor with two outlets. use one to the carb and one to the return line.

 

Which holley pumps do you know for a fact come with a regulator with two outlets? They don't say in their specs.

 

Holley mechanical pumps use a return line..but the electrics don't. The regs they come with are just normal non-bypass style regs.

If you don't need the return line..then don't use it. Most all lower-mid range fuel pumps are designed to work without one..including the Holley blue. You don't need the blue for an L05 tho...not by far. The red or any other brand equivilent would do fine.

As far as what to do with the return line..I dunno..stick a flower in it for decoration?

 

ok, thanks

 

I run the blue pump without using the return line but I am having to order a mallory 3 port return style regulator because it is building up way to much back pressure when sitting in traffic. It has blown my gasket on the back of my fuel pump. They recommend on street cars to use a return line. This keeps backpressure down and you have a steady supply of fuel waiting for you when you need it. No surges in the fuel supply. It also keeps strain down on your pump.

 

How much pressure are you running? Also, what did you have to do to repair the pump, how much did it cost, and how long did it last before the gasket blew?

 

I run between 6 1/2 to 7 1/2 lbs.

To repair the pump, I just went and got some gasket material and put a new gasket on it rather than buying a rebuild kit. It started leaking a few weeks after installing it. I still recommend the blue pump with a 3 port return style regulator. That way if you ever upgrade or add NOS, you will have the fuel supply ready and waiting.