Technical Blocking off the fuel pump return

Will it hurt a stock GM 350 fuel pump to block off the return line...?

Sent from my SM-G935V using The H.A.M.B. mobile app

 

Worked ok on the BBC fuel pump I used - from a '70 LS5 engine.

 

I was told it would collapse the diaphragm...

Sent from my SM-G935V using The H.A.M.B. mobile app

 

My new tank does have a return fitting...
Should I run the line?
Will I benefit?

Sent from my SM-G935V using The H.A.M.B. mobile app

 

if you are running 97's Clive from Stromberg says yes as it bleeds off the gas that may boil in heat situations. Being that you are in FL I would suggest that it is a wise move.

 

Definitely run the return if you have provisions for it.

 

Way back when mopar was still making 440s I was a dealer wrench and we had real problems with that fuel
pump byp*** on 440 cop cars, They really cost a lot of top speed in the summer and real hot start problems
too. One work around is to break an old style buss fuse, clean out one end, drill it with a small jet drill and
stuff it in the return line hose at the pump. This old work around came in handy last year when my oldy
[but OT] mopar wouldn't start after sitting. A dry float bowl even after cranking and short runs using the old
shot of gas down the airhorn trick was instantly cured with a vice grip on the fuel pump return line. I can't see how a plugged return line will damage an OE quality fuel pump.

 

Plugging the return line should not damage the pump.

I would either run a return line to the tank, or get the right pump. They don't cost much.

I put a return line on my truck, it fixed the fuel starvation issue, which I think was due to fuel boiling. It only did it when it was hot out.

 

The return was to help prevent vapor lock. I've seen plenty sbc run just fine with the return plugged off. Or just get a pump without the return.

 

Like Squirrel said....depends on climate...you can block it...

 

A fuel return line I installed on my 460 ci '46 pickup cured the vapor lock condition.
Keep it.

 

I blocked mine off on my off-topic truck. With a partly clogged fuel filter due to a rusty fuel tank, the return diverts enough fuel to cause fuel starvation much more readily than without a return.

The return will help prevent fuel flooding on shutdown.

 

What scares me about blocking off is if the cap or whatever fails. That fuel squirting out could sure "fuel the flame"

 

Well yes, it would be very bad if the cap or whatever plugs the line failed. But less bad than if the line between the pump and carburetor popped off. The pressure on both is the same, the flow through the return much less due to the restriction in the fuel pump connection.