i found out the problem with the mustang, half way through 2nd gear and most of 3rd if i want to get on it, she'll bog down. i thought it was too much air or too much gas, im told it's not enough gas. (made me proud) i have a forged cleveland w/2bbl heads and 750 carb. the engine guys i work with told me i need a bigger fuel line, where can i get one and how big should i go on a 73 mach.

i told my grandad this and he said he had that same problem on an old 396 truck, so he picked up an electric fuel pump and put in near the gas tank and it cured this problem. im not familiar with electric pumps. like diffrent sizes, where in the fuel line, or if this is even logical. his was a carberated engine too.

if anyone has any information on this, please let me know

 

I would keep it simple and go with a generic parts house pump. They are small and can be mounted inline directly in front of the tank between the sending unit and the hard line. Some are adjustable so you can vary the pressure. How fresh is the carb? Carbs with a lot of miles on them don't always respond well to the extra pressure especially if the float is no longer correctly set. For the sake of safety I recommend putting an automatic kill switch on the pump. This can be done by getting an EFI impact type unit that will cut the electric supply to the pump if the car is in an accident

 

I made 396 RWHP at 7200 Rpm with my 410c with the stock 5/16 line, now that I am after more power I am upgrading it to a 3/8

If you really think you are running out of gas, I would look for restrictions: crap clogging the intake in the tank, plugged filter, poorly performing mechanical pump etc. and get that squared away rather than tacking on a second pump.

 

i didnt have the problem tell i slapped in the 3.50. the engine is 6k miles on it with everything brand new. brand new everything in and outside the engine exempt the block and that's alighn bored and milled. the heads are completely mechined in. the cam is stock, but not for long. the big girl dont like running over 4500rpm wthout running out of power, not like before the build. so i think it might be alittle smaller... the carb only has less than 500 miles on it. everything is balanced and blueprinted from the pullies to drive shaft. i have an electric fan and distributor.

i have no idea how much hp i have, but i'll spin through 1st and most of 2nd and 2 sec spin in 3rd. with a c6 (no shift kit) anyone out there can give an estemate before i get it dynod?

 

i'd take it to a dyno for tuning purposes not ego purposes. the stock fuel line should be enough. as nick suggests, there is another issue there. 750 is a lot of carb for a 351 with a stock cam. my guess is the fuel pump and/or carb is not set up right.

i am going to be using an edelbrock mechanical fuel pump on a 600 (engine) hp 408 with 3/8 line. the pump is good for 130 galls per hour! I have no issue with electric setups except it adds another potential failure point. the mechanical pump is likely to rob a few hp, but i have them to spare so not concerned

 

The 5/16 inch fuel line should be more than adequate for your setup. As Aussie alluded, that 750 cfm carb is too big for that engine. I would think you are getting too much gas, and not the other way around.