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Hi all. Got a question for you. I have a question about a wood chipper. It has a carborated 300-6. Im looking at buying a 300 efi as I can't find a good carborated engine. I know I'll have to drill out for the mechanical fuel pump. I also know I have to switch the manifold. Question I have is will the manifold from my old engine bolt right up? The engine I have I believe is from the 70's. i'm looking at getting an efi from the 90's. Any suggestions would help. Also, I'm pretty sure I'll have to swap the gear on my distributor. Thanks in advance for any info
A carbureted intake manifold should bolt onto a newer EFI 300.
If my understanding is correct you just need to cut the hole for the mechanical pump, drill and tap holes, and install all the carburetor parts. Someone else will have to confirm it though.
The intake will bolt up to it perfectly. You'll have 3 extra bolt holes but those are only there to help with manifold alignment on later year engines and don't affect clamping pressure.
An alternative option to drilling the fuel pump hole is to simply get an electric fuel pump. Just be sure to get one that limits at around 7psi.
As far as I know, the 300 used the same camshaft from 1968 to 1998, so there shouldn't be any issue with the distributor gear. I've never done it though, so I can't say that for 100%.
Ok Thank you both! I've been looking at the electric fuel pump. Only issue I would see is how to wire it up. Some guys said wire it to the oil pressure switch? Not sure how to do that. I don't want it wired directly to the ignition so it doesn't flood if it stalls. I just figured the mechanical pump is easier once its all set-up. Cheaper replacement in the future and eliminates the operator error aspect.
I was talking to a member who is building a EFI motor to replace one in his 83 f150 pick up.
As said you need to drill& tap for the fuel pump mounting but.........
when he pulled the cam on the EFI motor to check cam bearings he found the fuel pump lobe was not polished.
He said he polished his and will run break in oil till the pump lobe is broke in so it will not go flat like a new cam lobes can.
Ok Thank you both! I've been looking at the electric fuel pump. Only issue I would see is how to wire it up. Some guys said wire it to the oil pressure switch? Not sure how to do that. I don't want it wired directly to the ignition so it doesn't flood if it stalls. I just figured the mechanical pump is easier once its all set-up. Cheaper replacement in the future and eliminates the operator error aspect.
if the jets are open and the fuel pumping is pumping, wouldn't it flood? I'm not sure that's why I threw it out there. Fuzzface2, he is correct. The lobe is unpolished. I have to polish mine tomorrow. I got the hole cut. It was actually pretty easy. Fuel pump lines up nice.
Its not perfect but it works. And you can see the unpolished lobe inside.
I can't take all the credit Tarheel Blue told me about it the other day as he is rebuilding a EFI motor but going to run carb and fuel pump in his 83? F150
Dave - - - -
Finally got it all done. Fan shroud is zip-tied for temporary fix. Had to order a new one but I need the chipper tomorrow. She ain't the prettiest but she gets the job done!
01-19-2017, 05:20 PM
