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Old 03-20-2020, 02:16 PM   #1
72gmguy
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Soon to be msd atomic install on my 72 blazer

Last year I purchased an msd atomic fuel injection basic kit to install on a truck that I have since sold. I have decided to install it on my 72 blazer and have a couple of questions. I’ve already decided on ptfe fuel line after reading about all the issues with fuel smell and rubber based hose. Now I’m trying to find the best high pressure fuel pump to use. I looked on summit and every inline pump has complaints of quitting after very short run time. Has anyone had a good, reliable fuel pump they would recommend? I would like to use my stock tank but am open to other options if none of these pumps are reliable. How about the retro-fit fuel pump modules from Holley?
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1969 Blazer 4x4 original cst
1971 Blazer partial 2wd convert
1972 Blazer 4x4 original cst
1970 Blazer 4x4 w/ 2 1/2in lift and 33in tires w/4 wheel camper
1970 4x4 suburban w/ 6in lift and 35in tires
1968 Corvette convertible
1970 Malibu convertible
1959 Brookwood wagon
1972 International Scout ii
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Old 03-20-2020, 03:28 PM   #2
Thealien
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Re: Soon to be msd atomic install on my 72 blazer

In tank pumps are cooled by being immersed in the fuel. One of the reasons the external pumps fail. I don't have an answer for you but IMHO I would look for an in tank option!
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Old 03-20-2020, 10:17 PM   #3
72gmguy
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Re: Soon to be msd atomic install on my 72 blazer

I agree. I figured a lot of failures came from mounting the pumps too high or too far from the tank causing them to overheat. I was hoping someone here used one of the Holley retro-fit fuel modules for in tank mounting.
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1969 Blazer 4x4 original cst
1971 Blazer partial 2wd convert
1972 Blazer 4x4 original cst
1970 Blazer 4x4 w/ 2 1/2in lift and 33in tires w/4 wheel camper
1970 4x4 suburban w/ 6in lift and 35in tires
1968 Corvette convertible
1970 Malibu convertible
1959 Brookwood wagon
1972 International Scout ii
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Old 03-21-2020, 05:20 PM   #4
mister.freeze
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Re: Soon to be msd atomic install on my 72 blazer

I had Holley Pro-Jection for years. The pump in the kit never failed. Only removed and sold the system because I wanted more than the 650CFM it was rated. inline pump was mounted inside the frame rail about 2 feet from the tank.
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Old 03-21-2020, 05:46 PM   #5
litebulblsc
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Re: Soon to be msd atomic install on my 72 blazer

I have 2 vehicles running inline pumps. Neither gets driven much though...
Blazer has a cheaper Holley pump that came with the Sniper throttle body injection kit.
Then a Sierra I built with a dual Holley pumps with intentions of staging them, but have them wired together now.

Blazer's is mounted kind of high right above the axle in the frame rail. They tell you to mount them at the level of the bottom of the tank.

Sierra has them mounted below the fuel cell and cell is sumped
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Old 03-21-2020, 09:50 PM   #6
72gmguy
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Re: Soon to be msd atomic install on my 72 blazer

Thinking about trying this:
https://documents.holley.com/199r10934.pdf

I have an old poly tank that I don’t mind drilling a hole in to try it. It’s never had gas in it.
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Jeremy

1969 Blazer 4x4 original cst
1971 Blazer partial 2wd convert
1972 Blazer 4x4 original cst
1970 Blazer 4x4 w/ 2 1/2in lift and 33in tires w/4 wheel camper
1970 4x4 suburban w/ 6in lift and 35in tires
1968 Corvette convertible
1970 Malibu convertible
1959 Brookwood wagon
1972 International Scout ii
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Old 03-22-2020, 07:34 AM   #7
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Re: Soon to be msd atomic install on my 72 blazer

Quote:
Originally Posted by mister.freeze View Post
I had Holley Pro-Jection for years. The pump in the kit never failed. Only removed and sold the system because I wanted more than the 650CFM it was rated. inline pump was mounted inside the frame rail about 2 feet from the tank.
So the Holley pump worked for you. That’s good to hear. The reason I didn’t buy the master kit from msd was because of all the failures I read about with their pump. That and I wanted ptfe line. The In-Tank module ends up being $300 more than a medium priced Holley pump. Decisions decisions.
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Jeremy

1969 Blazer 4x4 original cst
1971 Blazer partial 2wd convert
1972 Blazer 4x4 original cst
1970 Blazer 4x4 w/ 2 1/2in lift and 33in tires w/4 wheel camper
1970 4x4 suburban w/ 6in lift and 35in tires
1968 Corvette convertible
1970 Malibu convertible
1959 Brookwood wagon
1972 International Scout ii
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Old 03-22-2020, 07:38 AM   #8
72gmguy
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Re: Soon to be msd atomic install on my 72 blazer

Quote:
Originally Posted by litebulblsc View Post
I have 2 vehicles running inline pumps. Neither gets driven much though...
Blazer has a cheaper Holley pump that came with the Sniper throttle body injection kit.
Then a Sierra I built with a dual Holley pumps with intentions of staging them, but have them wired together now.

Blazer's is mounted kind of high right above the axle in the frame rail. They tell you to mount them at the level of the bottom of the tank.

Sierra has them mounted below the fuel cell and cell is sumped
Thanks for your input. That’s two good Holley pump experiences. Starting to think that a Holley pump retro module may be the way to go. I see your in MI. I plan to be there for Woodward Dream Cruise in august....if the corona virus allows it.
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Jeremy

1969 Blazer 4x4 original cst
1971 Blazer partial 2wd convert
1972 Blazer 4x4 original cst
1970 Blazer 4x4 w/ 2 1/2in lift and 33in tires w/4 wheel camper
1970 4x4 suburban w/ 6in lift and 35in tires
1968 Corvette convertible
1970 Malibu convertible
1959 Brookwood wagon
1972 International Scout ii
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Old 03-25-2020, 11:43 AM   #9
72gmguy
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Re: Soon to be msd atomic install on my 72 blazer

I ordered the Holley retrofit in tank pump module from summit. I will have it Saturday. I’m going to get started on the install while I wait on the pump.
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Jeremy

1969 Blazer 4x4 original cst
1971 Blazer partial 2wd convert
1972 Blazer 4x4 original cst
1970 Blazer 4x4 w/ 2 1/2in lift and 33in tires w/4 wheel camper
1970 4x4 suburban w/ 6in lift and 35in tires
1968 Corvette convertible
1970 Malibu convertible
1959 Brookwood wagon
1972 International Scout ii
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Old 03-29-2020, 11:08 AM   #10
72gmguy
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Re: Soon to be msd atomic install on my 72 blazer

Started working on the blazer yesterday. Removed the carb and installed the carb spacer/adapter and the throttle body.
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Jeremy

1969 Blazer 4x4 original cst
1971 Blazer partial 2wd convert
1972 Blazer 4x4 original cst
1970 Blazer 4x4 w/ 2 1/2in lift and 33in tires w/4 wheel camper
1970 4x4 suburban w/ 6in lift and 35in tires
1968 Corvette convertible
1970 Malibu convertible
1959 Brookwood wagon
1972 International Scout ii
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Old 03-29-2020, 11:18 AM   #11
72gmguy
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Re: Soon to be msd atomic install on my 72 blazer

Drilled the hole for the Holley fuel pump module and cleaned up the tank.
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Dropped the old tank and found every fuel line is hard and dry except for the fill which was soft and sticky like it was being eaten through. So I ordered some 1-3/8 fill hose to make a new one and I will use some standard fuel line to fix the rest.

Today I will try to make some lines to go from the pump to the throttle body with the ptfe line and -an fittings as well as install the fuel pump module.
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Jeremy

1969 Blazer 4x4 original cst
1971 Blazer partial 2wd convert
1972 Blazer 4x4 original cst
1970 Blazer 4x4 w/ 2 1/2in lift and 33in tires w/4 wheel camper
1970 4x4 suburban w/ 6in lift and 35in tires
1968 Corvette convertible
1970 Malibu convertible
1959 Brookwood wagon
1972 International Scout ii
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Old 03-29-2020, 11:46 AM   #12
litebulblsc
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Re: Soon to be msd atomic install on my 72 blazer

You might have a clearance issue with where you drilled your hole. If you reference my pic up above, it looks to be inline with the second to last body mount location. My tank pretty much touches that bed sill/ floor crossmember.
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Old 03-29-2020, 12:18 PM   #13
72gmguy
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Re: Soon to be msd atomic install on my 72 blazer

I thought that too but the kit comes with strips to lower the tank to use in place of anti squeak stuff between the tank and frame. They are about 3/4 inch so I hope I have enough room. The mat on the bottom of the tank is huge and makes mounting positions very limited.
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Jeremy

1969 Blazer 4x4 original cst
1971 Blazer partial 2wd convert
1972 Blazer 4x4 original cst
1970 Blazer 4x4 w/ 2 1/2in lift and 33in tires w/4 wheel camper
1970 4x4 suburban w/ 6in lift and 35in tires
1968 Corvette convertible
1970 Malibu convertible
1959 Brookwood wagon
1972 International Scout ii
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Old 03-29-2020, 12:22 PM   #14
72gmguy
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Re: Soon to be msd atomic install on my 72 blazer

You have to avoid the sender too.
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Jeremy

1969 Blazer 4x4 original cst
1971 Blazer partial 2wd convert
1972 Blazer 4x4 original cst
1970 Blazer 4x4 w/ 2 1/2in lift and 33in tires w/4 wheel camper
1970 4x4 suburban w/ 6in lift and 35in tires
1968 Corvette convertible
1970 Malibu convertible
1959 Brookwood wagon
1972 International Scout ii
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