EFI fuel tank

I did have to put a little bump in the spare tire well to make room for it.

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horsepowerjunkie said:
So the 88-89 M body cars did not have the TBI 318 engine?
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No, they were carbed till the end. Which is a bit odd because trucks got it and those two years got some of the biggest changes in the entire run next to the shift from the 70s to 80s styling.
 
Mikes5thAve said:
No, they were carbed till the end. Which is a bit odd because trucks got it and those two years got some of the biggest changes in the entire run next to the shift from the 70s to 80s styling.
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Interesting! I assumed the cars got the same as the trucks
 
twali40 said:
I did have to put a little bump in the spare tire well to make room for it.

View attachment 57727
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Ahhh...got it now...at first I couldn't tell if that 1st pic was just a "side by side" compare of the fitting...but the genius in-tank pics shows this very well!

Nice sir...thank you for sharing this.

BTW: given the stamped ribs in tank body, did you have to 'massage' that area for the Holley piece to seal-up? I imagine the answer is a yes, so I'm curious what you found worked best to get that done..after all, hard to talk about flattening these out unless you get something into the tank itself to be the 'anvil' in that situation.
 
I was able to build a custom in tank fuel pump and sender based on a Holley blog.

I posted pictures of the results in a thread about the overall Magnum engine change project.
 
M_Body_Coupe said:
Ahhh...got it now...at first I couldn't tell if that 1st pic was just a "side by side" compare of the fitting...but the genius in-tank pics shows this very well!

Nice sir...thank you for sharing this.

BTW: given the stamped ribs in tank body, did you have to 'massage' that area for the Holley piece to seal-up? I imagine the answer is a yes, so I'm curious what you found worked best to get that done..after all, hard to talk about flattening these out unless you get something into the tank itself to be the 'anvil' in that situation.
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Have you thought of cutting an area out for clearance and making a cover for it? One of my cars that's what the factory did. Makes getting to the sender so much easier.
 
M_Body_Coupe said:
Ahhh...got it now...at first I couldn't tell if that 1st pic was just a "side by side" compare of the fitting...but the genius in-tank pics shows this very well!

Nice sir...thank you for sharing this.

BTW: given the stamped ribs in tank body, did you have to 'massage' that area for the Holley piece to seal-up? I imagine the answer is a yes, so I'm curious what you found worked best to get that done..after all, hard to talk about flattening these out unless you get something into the tank itself to be the 'anvil' in that situation.
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I didn’t have to massage the tank ribs. Holley has a pretty thick foam gasket that is designed to seal against the height of the ribs.
 
Mikes5thAve said:
Have you thought of cutting an area out for clearance and making a cover for it? One of my cars that's what the factory did. Makes getting to the sender so much easier.
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If I did it again, I would cut an opening in the trunk pan and fab a small dog house cover instead of just hammering a dome over the pump. But, more because it would be a cleaner solution than a need to make access simpler. These tanks are super easy to drop.
 
The only FMJ to have factory fuel injection was the 1981-83 Imperial. It had a special fuel tank for the pump, part number 4185578. Not sure how much different it is than the stock tank with fuel filler placement, and good luck ever finding one that isn't ruined. They used Tokheim centrifugal fuel pumps to lift fuel up to the metering assembly in the air cleaner, which had more pumps to step the pressure up for metering at idle and high speed. The tank pump had two speeds based on flow demand, it operated at 7.5 to 11.5 psi so it can't operate a conventional throttle body. You could likely install a regulator and feed a carburetor with it, that kind of setup is superior to any of the throttle body injection units offered today anyway. Here's all the info on the lift pump parts, interestingly they changed the assemblies a whole 3 times in one model year.

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