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Username Post: Electric fuel pump? 80 1/2 ton Silvarado        (Topic#347624)
4dr 57 
"9th Year" Silver Supporting Member
Posts: 4449
4dr 57
Loc: Texas Hill Country
Reg: 11-10-04
10-11-17 09:19 AM - Post#2710518    

A Mechanic told me the other day that there was an electric pump that will just bolt in place of my stock fuel pump.
Then turned away and went back to work. Its a busy shop and I didn't pursue the question.

FYI My f/p has 3 connections; 2 hoses and one steel line connection.
The smallest diameter hose meets a 1/4"steel line. I have no idea where it goes except that it heads back to wards the rear on the right side.
Neither of my 2 books shows anything about it.

Another line is from the rear to the pump also 3/8"? The last one goes to the carburator.


Would any one know of such a pump? I would gladly, no make that direly want to install one!
Thanks!




 
LMC Truck
raycow 
Honored Member
Posts: 26707
raycow
Loc: San Francisco, CA
Reg: 11-26-02
10-11-17 01:00 PM - Post#2710544    
    In response to 4dr 57

If you presently have a mechanical fuel pump which is bolted onto the engine and driven by the camshaft, you need to find out what your mechanic is smoking and try some. I am not aware of any electric fuel pump which mounts on the engine as he described.

Your 1/4" line is a return to the tank. The pump has more capacity then is needed by the engine most of the time, so fuel in excess of the engine requirements is recirculated. This also helps to keep vapor bubbles out of the line going to the carb.

Electric pumps do exist of course, and the ones which don't install in the tank typically bolt to the frame. If you install an electric pump without a return port you might also want to add an external pressure regulator with a return port or at least a filter with a return port. The fuel recirculation is also beneficial in keeping the pump motor cool.

Ray



There's a line between good and evil no wider than a razor's edge - D.S. James Hathaway quoting from The Night Keeper


 
4dr 57 
"9th Year" Silver Supporting Member
Posts: 4449
4dr 57
Loc: Texas Hill Country
Reg: 11-10-04
10-12-17 06:02 AM - Post#2710609    
    In response to raycow

RAYCOW Thanks for your input as your suggestions caused me to search LMC Truck's catalog. Lo and behold, they have something they call a fuel pump control module, which may be a way of losing the cold start blues.

An installation diagram for it will take a call to LMC as there's nothing listed in their catalog other than the part and its 5 assorted lines.

After reading the short blurb about it there is a distinct advantage to using it rather than a simple on/off electric pump because it shuts off when the motor stops running, so it must be hooked in to the tach circuit rather than the ignition switch. Looks like what I'm looking for.
Stanley



 
Liberty Valance 
Forum Newbie
Posts: 39
Liberty Valance
Loc: Euless,Texas
Reg: 07-21-14
10-12-17 07:08 AM - Post#2710617    
    In response to 4dr 57

  • 4dr 57 Said:
A Mechanic told me the other day that there was an electric pump that will just bolt in place of my stock fuel pump.
Then turned away and went back to work. Its a busy shop and I didn't pursue the question.

FYI My f/p has 3 connections; 2 hoses and one steel line connection.
The smallest diameter hose meets a 1/4"steel line. I have no idea where it goes except that it heads back to wards the rear on the right side.
Neither of my 2 books shows anything about it.

Another line is from the rear to the pump also 3/8"? The last one goes to the carburator.


Would any one know of such a pump? I would gladly, no make that direly want to install one!
Thanks!




Which vehicle are you wanting this for? I had thought about this myself, but have not moved forward yet.

1974 Cheyenne 10 LWB 350/TH350


 
Stinky 
Senior Member
Posts: 1553

Loc: Whitewater, CO
Reg: 05-25-01
10-16-17 07:30 PM - Post#2711076    
    In response to Liberty Valance

An electric pump sucks fuel poorly and pushes fuel well....therefore, unless you want it to vaporlock, the electric FP needs to be mounted as close to the tank as possible.



 
LMC Truck
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