Author Topic: 85 K1- atomic efi / fuel pump install help  (Read 1403 times)

Offline Patman

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85 K1- atomic efi / fuel pump install help
« on: November 30, 2022, 07:38:12 PM »
1985 K10, installing a Vortec 383 with 700r4/NP208. Adding the MSD Atomic EFI kit while I知 at it.  Since I知 going efi, I値l need electric pump(s) and have decided to install them in the saddle tanks per Holly痴 recommendation.

I知 at the point where my tanks are out. I致e cleaned them and am letting them dry over night. I知 installing the pump on the end of the sending unit and installing a sock on the inlet side of the pump, completing the assembly, save the wiring. Since I知 eliminating the smog stuff and the evap canister, that値l leave me with an unused vent line on the sending unit. I plan on running my hot line for the fuel pump in, through the vent-port (sealed with fuel resistant rtv) which値l go directly to the fuel pump. The new pump will use use the same ground that the sending unit uses.

Has anyone else done this and am I missing anything?
85 K10 350, 700R4, NP208, Quadrajet, Long Bed w/ 33痴
All stock except for the motor, used to be a 305.

Offline fitz

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Re: 85 K1- atomic efi / fuel pump install help
« Reply #1 on: December 01, 2022, 08:37:47 AM »
I can't help with your question, but I'm looking forward to your thoughts on the efi system once you get it up & running.

Offline JohnnyPopper

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Re: 85 K1- atomic efi / fuel pump install help
« Reply #2 on: December 01, 2022, 10:51:47 AM »
Sounds like FUN!

I haven't done anything like this but will your gas cap be a one-way vent to allow air into your tank as you deplete your fuel?
1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline Patman

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Re: 85 K1- atomic efi / fuel pump install help
« Reply #3 on: December 01, 2022, 01:13:53 PM »
Correct.
85 K10 350, 700R4, NP208, Quadrajet, Long Bed w/ 33痴
All stock except for the motor, used to be a 305.

Offline VileZambonie

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Re: 85 K1- atomic efi / fuel pump install help
« Reply #4 on: December 01, 2022, 04:30:24 PM »
Removing the Evap canister is not a good idea. I install them on all of my trucks.
,                           ___ 
                         /  _ _ _\_
              ⌠ッッッッッ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline JohnnyPopper

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Re: 85 K1- atomic efi / fuel pump install help
« Reply #5 on: December 01, 2022, 07:30:15 PM »
Curious VZ, where would you connect the bowl vent tubing to?

To be honest I don't even know how they work... :D
1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline VileZambonie

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Re: 85 K1- atomic efi / fuel pump install help
« Reply #6 on: December 02, 2022, 09:26:16 AM »
I'm assuming you mean the canister purge hose, not bowl vent. The canister has a vent, tank connection and purge to the intake. I install a check valve, and sometimes a vacuum operated purge valve but it really depends on the setup, i.e. carburetor, type, EFI etc. Every setup will require a different plumbing layout.
,                           ___ 
                         /  _ _ _\_
              ⌠ッッッッッ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline JohnnyPopper

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Re: 85 K1- atomic efi / fuel pump install help
« Reply #7 on: December 02, 2022, 02:38:49 PM »
Understood. They must serve some purpose then.

I meant the large vac lhose at the front of the (in this case) QJet.

1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline fitz

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Re: 85 K1- atomic efi / fuel pump install help
« Reply #8 on: December 28, 2022, 01:57:32 PM »
Any updates on your EFI install?