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Electric AND Mechanical Fuel pump

AZ73

Contributor
Bronco Guru
Joined
Mar 28, 2012
Messages
3,546
Sorry if this has been discussed. I did a search and nothing came up, and Broconuts thread made me think about it. I was talking to a guy in Denver and he said he runs an electrical pump to circulate his fuel through an accumulator and back to the tank, then outputs the accumulator to a mechanical pump. He said he does this to keep vapor lock out of the fuel lines at altitude. I'm running a carb and living in AZ where it gets nice and hot. I was just going to run an electric straight to the carb, but this sounds like an interesting set-up. Any comments pro or con?
 

broncnaz

Bronco Guru
Joined
May 22, 2003
Messages
24,341
I ran a electic and mechanical for a few years no issues although I did worry about the mechanical failing and the electric filling up the crankcase up with gas fast. Once the mechanical started leaking I quickly removed it and only run a electric now.
If you have a good quality electric I would only run that. really no sense in running double pumps.
 

patterdale

Bronco Guru
Joined
May 24, 2010
Messages
1,247
Sounds like the guy was over-impressed with an abundance of technology. A good electric pump as close to the tank as possible with some sort of rollover/inertia switch is all that is needed.
 

70_Steve

Old Guy
Joined
Dec 13, 2002
Messages
8,317
I believe in the KISS principal. I ran a single Carter 4070 pump with my carb for 15 years with no vapor lock and no failures.

Now, with EFI, I run a single frame-mounted E2000 pump. Have been up to 7000 ft elevation with no problems.
 

needabronco

Bronco Guru
Joined
Jul 2, 2004
Messages
6,411
Loc.
Prescott/Farmington
The ONLY time I had any vaporlock issues was at high altitude (above 11,000'), I was running a low pressure pump to an accumulator, then a high pressure pump with an EFI setup. After a bit of research I dumped the accumulator system in favor for a single fuel pump system and never looked back. I did however upgrade to an in-tank fuel pump.

For a carburator, I see no advantage of running 2 pumps OR an accumulator. Your fuel bowl in the carb is already an accumulator if you think about it...
 
OP
OP
AZ73

AZ73

Contributor
Bronco Guru
Joined
Mar 28, 2012
Messages
3,546
Thanks for all your insights!
 

ChrisC74

Sr. Member
Joined
Dec 9, 2010
Messages
904
Now, with EFI, I run a single frame-mounted E2000 pump. Have been up to 7000 ft elevation with no problems.[/QUOTE]

Steve - how loud is that E2000?
 

ObscureMachine

Seatbelt Orifice Officer
Joined
Sep 28, 2006
Messages
3,998
Loc.
World Headquarters
I ran a electic and mechanical for a few years no issues although I did worry about the mechanical failing and the electric filling up the crankcase up with gas fast. Once the mechanical started leaking I quickly removed it and only run a electric now.
If you have a good quality electric I would only run that. really no sense in running double pumps.

x2.

carter 4070 is all you really need.
 

chuck

Bronco Guru
Joined
Aug 14, 2001
Messages
6,474
Loc.
Ingram, Texas
For a carb I like the mechanical pump. If you want put a ele. pump near the tank and use it as a back up. Turn it on if you run out then turn it off. The mechanical will suck right through the ele. then if you vaper lock you can turn the ele. on and that should clear the problem.
PS needabronco is right about not needing a ACC with a carb.
 
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