I need a little help picking right elec fuel pump and what size line should I
use from the gas tank to carb. I want to get the right parts the first time around and the people here know there stuff.

My combo
68 Chevelle
GMPP 383/425
GMPP single-plane intake
Holley 750 DP
Hooker super comp 1 3/4 headers
TCI Street Fighter Trans 2.75 1st gear
10" streetfighter TQ 3000 stall
Currie 12 bolt with 373 Detroit Truetrac

You may only get one of these toys in your life so have fun with it.

Alot of guys here are running a Carter 172gph mechanical pump but I`ve never used one. If your using your stock tank the biggest you could go without moding it is 3/8". If you go with a fuel cell or add a sump to your tank you can go with -8. alot of guys will use the 3/8" pickup tube and then run 1/2" from there but in my opinion, thats still a 3/8" line. Your still sucking the fuel from a 3/8" tube. Some guys will run -8 from the cell to the pump and then -6 to the carb. Thats basicaly a -6 system because your still feeding the carb with a -6 line. it doesn`t matter how big you started with. I`m doing the -8 to -6 thing only because I`m going to be running a pretty stock motor for a while and once I get the hot motor in all I got to do is change 1 small section to -8 and I won`t have any feed problems. This is just my opinion and others will give you theirs.

Should i go to a fuel cell or a fuel tank sump in this car or is the stock 3/8"
line large enough. I just want to make sure engine has adequate fuel supply.

P.S. This is just a weekend car.

I would go with a sump on your stock tank and run a 1/2" line from tank to carb but you might be ok with the stock 3/8" line but if you step the power up later or use NOS you`ll need to upgrade your system.

Well, I ran 11.30's with a 468 BB with the stock 3/8 pickup and line and a Carter mechanical Pump. No need to sump the tank or use an electric. Keep It Simple. You will be glad you did in the long run.

I also ran 10.78 with a 540 and a Carter Mechanical Pump. I had -10 line and a sumped tank, but still it was a mechanical pump.

I would like to stay with elec pump. About 10 years ago somebody tried to take my car but they didn't now about the hidden fuel pump switch. Ran the batt dead trying though. Little extra ins i guess.

You can use the factory 3/8 line with a Mallory 140 pump. A great combination...

The 140 needs a return line though, correct? Wouldn't an internally regulaed Mallory 110 and the 3/8 line do the job up to the 475HP range?

The 140 needs a return line though, correct? Wouldn't an internally regulaed Mallory 110 and the 3/8 line do the job up to the 475HP range?

Nope, it doesn't need a return line. It is available with your choice of a dead-head regulator (4207) or a return style regulator (4309). They sell the pump in two different kits.

Yes a Mallory 110 would also work.

Tom,

I guess I misunderstood how these worked. I was under the impression the 140 (or similiar higher pressure pump) would have a shortened life with a dead head regulator. That's the main reason I was personally looking at the 110. From the info I have been able to find, a lower capacity pump like the 110 could also work well using the stock tank pickup as long as the pump is mounted lower than the tank, but something like the 140 needs to draw from a sump in order to deliver the capacity, especially if it uses a return style regulator. Does this sound correct?

I know alot of people who have used the 140 pump with a regulator with no problems.

Thanks for the info guys. I think I'll look into the 140 with the return.

Tom,

I guess I misunderstood how these worked. I was under the impression the 140 (or similiar higher pressure pump) would have a shortened life with a dead head regulator. That's the main reason I was personally looking at the 110. From the info I have been able to find, a lower capacity pump like the 110 could also work well using the stock tank pickup as long as the pump is mounted lower than the tank, but something like the 140 needs to draw from a sump in order to deliver the capacity, especially if it uses a return style regulator. Does this sound correct?


Theoretically yes, a pump with a "dead head" regulator will have to work harder and it will be noisier thereby having a lower life (theoretically). The fuel is said to be warmer as well. A return style will hold constant pressure better as well. Because of all the street miles I put on, it is the reason I went with a return style setup. Now I am not saying all or any of these things will slow you down, they are just things that are different between the two styles of regulator and how they effect the pump and pressure

If one could use the 110 pump and be successful, by all means they should do so or at least try it. A test using a 110 pump and getting rid of my -10 supply and -8 return lines and running 3/8 hard line is on my list for this summer in an effort to simplify my setup and take off some weight.

As far as reaching capacity, most (if not all) electric pumps work better gravity fed. I do know that Ed Bigley uses a 140 pump pulling from the stock pickup uses a 3/8" hard line and he launches in the 1.30 60 ft range and has turned 10.30's.

Ed who??? :D

Ed who??? :D

That's the spirit. ;)

Theres a few places that overkill is a good thing...and I think the fuel system is one of them. If you go with the 110 and step up in power you'll have some more parts and pieces for the yard sale.