1966 289 bogging down and keeps getting worse

[Ihatethisdamncar]

My car started doing this after taking off a cheap electric fuel pump and reconnecting the old one. Last night it would run ok until high rpm’s, but this morning it would hardly even get out the driveway. I’ve tuned the carb multiple times. I’ve replaced spark plugs, I’ve done just about everything and it seems to just get worse. Any help will be appreciated.

 

[wicked93gs]

What does your air fuel ratio look like under load?(should be able to tell by reading your plugs after shutting down the car immediately after a bog). Your plugs will at least tell if its rich or lean.

 

[Ihatethisdamncar]

What does your air fuel ratio look like under load?(should be able to tell by reading your plugs after shutting down the car immediately after a bog). Your plugs will at least tell if its rich or lean.

It’s always ran rich no matter what I do.

 

[Hot Stang]

Check fuel pressure. Old pump might have taken a dump.

 

[Hot Stang]

Does your car require a return? If so you must hook one up or it will never run right. You'll be flooding your carb with fuel. I'm running stock in tank pump. Because of my return my pump runs constantly but only regulated amount of fuel goes to carb.

 

[WingsOfGold]

Check the obvious......... fuel filter otherwise buy another mechanical pump.

 

[Hot Stang]

Check the obvious......... fuel filter otherwise buy another mechanical pump.

Fuel pressure test would tell him about filter. Same filter that was on other pump so it should be ok. It worked before.

 

[WingsOfGold]

Fuel pressure test would tell him about filter. Same filter that was on other pump so it should be ok. It worked before.

In theory yes but for 5 bucks................

 

[Hot Stang]

I find it easier to go from new school motor to old school car than it is to go other way. I'm playing hell but those 450 HP, before I add NOS, will be a wild ride in itself when I get it right.

 

[Hot Stang]

View: https://youtu.be/z8FaAW-oXcg

 

[Hot Stang]

400 hp 302 Small-Block - Mustang & Fords Magazine

Check out this 302 small-block making 400 hp on pump gas, only on Mustang & Fords Magazine.

www.motortrend.com

Basically my build except a few changes. You heard the gear drive. Running GT40P heads also with upgraded springs.