Fuel pump Question on 409 Engine.

[Aqua409ss]

Hi
for years I've been having problems with my Spark plugs fouling in 409 Engine 2x4"s . I thought this was something id had to put up with , while driving around the city.
Now I'm starting to think that its because of my fuel pump keeping a constant flow trickling when the engine has been shut down. Im now thinking it best to connect the return Fuel line to stop the pressure .Having troubles with starting , fouling plugs (wet and oily) have had carter carbs rebuilt now thinking its the seats not closing.

I also had noticed my fuel pump has been leaking and decided to take it oft inspect it.. I've noticed its a Carter #4656. I believe this is for a 58-62 Corvette 283 327 and not a 409.

Is this the right fuel pump for my Application? and should i keep using it?

Also wonder if i need to rebuild the fuel pump? should the fuel pump keep flowing petrol though it when the engine is not running? or should it seal when the engines stopped ?


Thanks for any Advice

 

[Don Jacks]

The mechanical pump doesn't make any pressure when the engine isn't running but it could be making too much pressure when it is,test it..Do you have heat spacers under those carbs?

 

[Aqua409ss]

Thanks for the reply Don .I will have a look in the morning .

 

[Hoyt99]

Hey Don, what exactly are the heat spacers you refer to? Just the phenolic blocks used to slightly raise the carbs? Do they relay do much?

thanks for sharing your experience and counsel

Chip

 

[Don Jacks]

They insulate the carbs from the manifold heat.AFB's and Edelbrocks are aluminum and actually attract heat which makes the boiling the fuel problems worse.Yes they are needed and yes they help.