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Username Post: Electric fuel pump, how to wire?        (Topic#368414)
impala 
Frequent Contributor
Posts: 1303
impala
Loc: Pittsburgh, PA USA
Reg: 07-13-00
05-13-22 10:33 AM - Post#2841147    

If anyone has installed an inline, low pressure elec. fuel pump where did you wire it into? Do you have it run constantly with the engine running or only during key on and engine cranking to fill the carb bowl? On my 61, 283 I'm trying to get away with always having to prime the carb on start up after it's been sitting a while.
Thanks
impala

61 Impala Convertible, AACA Senior Grand National
99 Jaguar, XK8
13 Avalanche LTZ
18 Equinox


 


Lead sled 
Frequent Contributor
Posts: 2154
Lead sled
Age: 62
Loc: Walton,NY.
Reg: 11-04-09
05-13-22 11:48 AM - Post#2841151    
    In response to impala

Instructions should come with the pump. I wired mine to the ON/RUN side of ignition switch

Late yr model (Dec. 51 Bel Air/ 52 trim), with a basically stock 68 Camaro SS350/300hp Turbo Fire Edelbrock 1405,Saginaw 4spd/355 geared 55/6 Chevy rear.2,1st places, and 1 top five award trophies so far



 
impala 
Frequent Contributor
Posts: 1303
impala
Loc: Pittsburgh, PA USA
Reg: 07-13-00
05-13-22 12:35 PM - Post#2841155    
    In response to Lead sled

No instructions with the pump.
Did you keep the mechanical pump in place?

61 Impala Convertible, AACA Senior Grand National
99 Jaguar, XK8
13 Avalanche LTZ
18 Equinox


 
dcairns 
Frequent Contributor
Posts: 2303
dcairns
Loc: Orange CA
Reg: 11-07-03
05-13-22 03:26 PM - Post#2841163    
    In response to impala

This is a project I have had on my to-do list for the same reasons. Lots of cranking the engine to get the carb filled up again after being parked for a week.

I had been reading in the "Performance and other Engine/Transmission Topics" section here at Chevy Talk and learned the following:

You need to be sure the pump has the correct fuel pressure for your carburetor.

Some people complain of the pump being noisy. So selecting a quiet pump and mounting it properly are the two big "take-aways" I got from that.

Ideally you would want some means of determining if the engine is running so the pump can shut down if the engine is not running. For instance, if you have an accident and the fuel line is broken some where after the pump, you could be spraying gas all over the place.

My plan was to remove the mechanical pump internals so fuel could flow through. Retaining stock appearance.


- Dave
1964 Impala 4-door sedan



 
Tony1963 
Frequent Contributor
Posts: 1283

Loc: Orlando Florida
Reg: 07-09-18
05-13-22 03:32 PM - Post#2841164    
    In response to impala

You can study the wiring circuit out of an old Chevy Vega which did use an electric fuel pump. The circuit allowed the pump to run for a pre-determined time then looked for a complete circuit on the oil pressure sender.

The idea is that no oil pressure, no power to the fuel pump.



 
impala 
Frequent Contributor
Posts: 1303
impala
Loc: Pittsburgh, PA USA
Reg: 07-13-00
05-13-22 07:27 PM - Post#2841173    
    In response to dcairns

  • dcairns Said:
You need to be sure the pump has the correct fuel pressure for your carburetor.

Some people complain of the pump being noisy. So selecting a quiet pump and mounting it properly are the two big "take-aways" I got from that.

Ideally you would want some means of determining if the engine is running so the pump can shut down if the engine is not running. For instance, if you have an accident and the fuel line is broken some where after the pump, you could be spraying gas all over the place.

My plan was to remove the mechanical pump internals so fuel could flow through. Retaining stock appearance.



I did think about the pressure and the one I have is similar to the stock pump.
I've also heard of the noise so I'll do some type of rubber mounts.
I'm thinking of running the wiring thru a momentary switch and only run the electric pump just enough to fill the carb. That's all I really want it for anyway.
impala


61 Impala Convertible, AACA Senior Grand National
99 Jaguar, XK8
13 Avalanche LTZ
18 Equinox


 
impala 
Frequent Contributor
Posts: 1303
impala
Loc: Pittsburgh, PA USA
Reg: 07-13-00
05-13-22 07:32 PM - Post#2841174    
    In response to Tony1963

  • Tony1963 Said:
You can study the wiring circuit out of an old Chevy Vega which did use an electric fuel pump. The circuit allowed the pump to run for a pre-determined time then looked for a complete circuit on the oil pressure sender.

The idea is that no oil pressure, no power to the fuel pump.


I didn't know that about the Vega. I think I can eliminate the safety issue by running the pump just enough to fill the carb bowl. I'll use a spring loaded to off switch.


61 Impala Convertible, AACA Senior Grand National
99 Jaguar, XK8
13 Avalanche LTZ
18 Equinox


 
Lead sled 
Frequent Contributor
Posts: 2154
Lead sled
Age: 62
Loc: Walton,NY.
Reg: 11-04-09
05-13-22 08:30 PM - Post#2841177    
    In response to impala

No stock pump. Regulator set at 6 1/2 - 7lbs. Pump mounted to frame as close to tank as possible with filter before pump, and another at carb (Edelbrock 1405) rubber insulation stops SOME of the noise

Late yr model (Dec. 51 Bel Air/ 52 trim), with a basically stock 68 Camaro SS350/300hp Turbo Fire Edelbrock 1405,Saginaw 4spd/355 geared 55/6 Chevy rear.2,1st places, and 1 top five award trophies so far



 
impala 
Frequent Contributor
Posts: 1303
impala
Loc: Pittsburgh, PA USA
Reg: 07-13-00
05-14-22 05:51 AM - Post#2841190    
    In response to Lead sled

  • Lead sled Said:
No stock pump. Regulator set at 6 1/2 - 7lbs. Pump mounted to frame as close to tank as possible with filter before pump, and another at carb (Edelbrock 1405) rubber insulation stops SOME of the noise


Good info, thanks
impala


61 Impala Convertible, AACA Senior Grand National
99 Jaguar, XK8
13 Avalanche LTZ
18 Equinox


 
dcairns 
Frequent Contributor
Posts: 2303
dcairns
Loc: Orange CA
Reg: 11-07-03
05-14-22 08:22 AM - Post#2841194    
    In response to Lead sled

What pump did you use?

- Dave
1964 Impala 4-door sedan



 
Lead sled 
Frequent Contributor
Posts: 2154
Lead sled
Age: 62
Loc: Walton,NY.
Reg: 11-04-09
05-14-22 11:58 AM - Post#2841198    
    In response to dcairns

It's a Holley "RED" pump. For street perf. Part number 12-801-1
97 gph (free flow)... 67 gph @ 5 psi
press regulator not required, but I put 1 on anyway, pre set pressure of pump is @ 7psi

Late yr model (Dec. 51 Bel Air/ 52 trim), with a basically stock 68 Camaro SS350/300hp Turbo Fire Edelbrock 1405,Saginaw 4spd/355 geared 55/6 Chevy rear.2,1st places, and 1 top five award trophies so far



Edited by Lead sled on 05-14-22 12:29 PM. Reason for edit: No reason given.

 
bobb 
Super Senior Member
Posts: 5999

Loc: paradise
Reg: 09-05-03
05-15-22 12:28 PM - Post#2841225    
    In response to impala

i would use one of those buzz pumps tapped into the fuel line between the mechanical pump and carb. run off a push button starter switch for safety.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
kingkreeton 
Frequent Contributor
Posts: 1660
kingkreeton
Loc: Nashville TN
Reg: 04-15-11
05-15-22 12:45 PM - Post#2841227    
    In response to bobb

  • bobb Said:
i would use one of those buzz pumps tapped into the fuel line between the mechanical pump and carb. run off a push button starter switch for safety.



Can you please post a picture or a link for what you are referring to? I am curious to see how this is setup.

Shane
64 Impala SS:
Chevy Performance 350HO
4 Speed Muncie


 
dcairns 
Frequent Contributor
Posts: 2303
dcairns
Loc: Orange CA
Reg: 11-07-03
05-15-22 04:57 PM - Post#2841237    
    In response to kingkreeton

I am curious if these electric pumps allow fuel to pass freely when they are off. Freely enough so the mechanical pump won't be having a hard time keeping up the flow.

If they don't impede the flow when off, a cheap electric pump with a lower flow rate than needed for feeding the engine, would suffice to fill the carb before cranking.

- Dave
1964 Impala 4-door sedan



 
Mel Foye 
*VIP* Original Founding Member Group
Posts: 5352
Mel Foye
Reg: 09-29-00
05-15-22 08:02 PM - Post#2841241    
    In response to dcairns

I have a 57 235 that goes way dry very quickly. I bought a less than say a 30. electric pump just to fill the carb. Any kind of on and off switch. 3-4 pounds as just filling the carb. The sound changes when bowl gets to shut off so you let up.
Since this dry carb almost drains the battery sometimes even with starter fluid I figurer some anti theft as they have to crank and crank.
Check on the specific pump as I looked for free flow when not on.



It Was On Fire When I Laid Down.


 
impala 
Frequent Contributor
Posts: 1303
impala
Loc: Pittsburgh, PA USA
Reg: 07-13-00
05-18-22 03:29 PM - Post#2841442    
    In response to dcairns

  • dcairns Said:
I am curious if these electric pumps allow fuel to pass freely when they are off. Freely enough so the mechanical pump won't be having a hard time keeping up the flow.

If they don't impede the flow when off, a cheap electric pump with a lower flow rate than needed for feeding the engine, would suffice to fill the carb before cranking.


I have one of those cheap inline pumps and it's hard to blow through it so if you don't run it all the time when the engine is running I can't see the mechanical pump pulling fuel through it. When not running it's going to restrict the flow or allow no flow at all. I don't see it working just to fill the carb.
impala


61 Impala Convertible, AACA Senior Grand National
99 Jaguar, XK8
13 Avalanche LTZ
18 Equinox


 
impala 
Frequent Contributor
Posts: 1303
impala
Loc: Pittsburgh, PA USA
Reg: 07-13-00
05-18-22 03:35 PM - Post#2841443    
    In response to Mel Foye

  • Mel Foye Said:
I have a 57 235 that goes way dry very quickly. I bought a less than say a 30. electric pump just to fill the carb. Any kind of on and off switch. 3-4 pounds as just filling the carb. The sound changes when bowl gets to shut off so you let up.
Since this dry carb almost drains the battery sometimes even with starter fluid I figurer some anti theft as they have to crank and crank.
Check on the specific pump as I looked for free flow when not on.


Good to know. I'll look for one of those. You don't happen to know the brand or where you got it do you?


61 Impala Convertible, AACA Senior Grand National
99 Jaguar, XK8
13 Avalanche LTZ
18 Equinox


 
55Brodie 
Contributor
Posts: 393

Age: 70
Loc: Little River, SC
Reg: 12-26-15
05-19-22 08:11 AM - Post#2841473    
    In response to impala

https://www.pegasusautoracing.com/productdetails.a...



 
impala 
Frequent Contributor
Posts: 1303
impala
Loc: Pittsburgh, PA USA
Reg: 07-13-00
05-20-22 09:28 AM - Post#2841536    
    In response to 55Brodie

  • 55Brodie Said:

Got it, thanks


61 Impala Convertible, AACA Senior Grand National
99 Jaguar, XK8
13 Avalanche LTZ
18 Equinox


 


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