vapor lock/elec. fuel pump?

M

mainiac239

Member
47 ford truck


is it possible to have vapor lock after the fuel pump? in the carb?

if i put an electric fuel pump (i have a 12 v sys) between the fuel tank and stock fuel pump will the stock fuel pump regulate the fuel pressure?
or would it be better to just get rid of the stock pump and install an in line regulator?
 
Get an electric pump that pumps around 3.5 to 4 lbs pressure and install it near the tank and it will pump thru the original pump as needed and be sure it will let the vacuum pump pull fuel thru it. Will work fine.
 
I use a electric pump back by the tank to prime the carb when it has sat for awhile then switch it of once engine is running and just use the mechanical pump. Works well
 
If you add an electric fuelpump in line with the original pump, you could fill the engine with gas if the membrane get's a hole or rupture.
I would not combine them..

But That's me :-)

One important thing is to see to it so gas can't drainback to the fueltank, since the pump cant suck air. So double check all connections. and the rubber parts.
 
I put a Holley reg and a pump that puts out 3psi and insulated the carbs and had no trouble in 95 degree heat
 
I went to Auto Zone and ordered a 6 volt electric furl pump E8902 which only pumps3.5 PSI which cost 60 bucks including tax then went to NAPA and got a switch which when you pull on to make work but when you take your finger off to snaps off.TG6566 is the part number. That way when your car sits for a couple of weeks all you have to do is pull the switch on to pump gas to the carb and when you take your finger off its off.Us old fokes always forget as you know. Hope this helps someone.
 
I had a little vapor lock in my 51 truck and did the electric pump by the tank and then ran a 1/8 copper line from the line at the carb back to the tank and no more problems. Keeps the fuel cool that way. Also workd well if you have a regulator because it keeps the regulator working steady and the desired fuel pressure.
 
Ray, some good news and some bad news... The return line is good, but using a copper line is bad.
Copper ages badly, gets work hardened with vibration, heat & cool. I'd replace it before you wish you had.
Self immolation doesn't sound like fun to me.

BTW... The difference between a little vapor lock and a lot?

It goes like this:

Shake & shake the ketchup bottle ~ None will come ~ Then a lot'l
 
ford38v8 said:
Ray, some good news and some bad news... The return line is good, but using a copper line is bad.
Copper ages badly, gets work hardened with vibration, heat & cool.


Is it possible your refering to china made copper? I have copper lines that's 25 years old with no problems at all. I have never seen soft copper lines react to age or viberations within reason. I have seen flares crack due to being to thin and leak but properly flared I can't recall this problem. Live and learn I guess!
Click to expand...
 
Ray, I can tell you with some certainty that copper lines do age harden. I worked with 1/4" copper with flares for 15 years, and have seen them harden simply from laying dormant on a high shelf next to an outside corrugated iron wall. Apparently just that small change in ambient temperature over time caused the hardening. Of course, autoclaving and hydroclaving did them in real quick! Don't risk an accident, replace that copper gas line with steel!
 
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