Projects Banger coupe

Hoping to learn about fuel pumps for banger engines and what issues caused guys to add the pumps and get away from gravity feed. I have bigger pistons high compression head 6:1 a header and downdraft intake with a Stromberg 81. I couldnt seem to get the fuel into the carburetor in third gear unless I was just using the throttle really light.

 

I've got a similar setup with a Holly 94 and 6-1 head and had no problems with the gravity feed

 

What size fuel lines did you use? How is the fuel line placed because in order for me to get the fuel running downhill my fuel line is almost horizontal.

 

Simple, dropped axle! Then your fuel runs downhill!

 

Thanks for the help lol. this year over the winter I want to do a chassis and have a dropped beam but for now I need fuel

 

Tman’s response is serious. The bottom of the fuel tank and the carb inlet are nearly level. A dropped front axle and big/little tires can make enough difference to be significant. You also may want to keep your tank closer to full. For me, I bought a Tank’s tank and mounted it in the back and added a fuel pump. But an easier short term fix is to drop the front as much as possible to raise the gas level higher than the carb inlet.

 

Thank you for your response I know he was serious about his post. And I appreciate any advice I can get and take it all under serious consideration. In my case I'm not trying to change the dynamic of the chassis. Or use gravity feed I just wanted to gain a better understanding of fuel systems ie: return lines fuel pressure regulator and what can and can't be done

 

Ok, on mine, I initially ran with a fuel pump and generic cheap regulator. The cheap regulators are not worth much, imho, and I currently run without a regulator, on my mechanic’s advice. I expect I will buy a good regulator at some point after I pull the current motor and install my new Burtz motor. I have only used the fuel bypass line on high pressure fuel pumps.

 

I bought the Carter six volt 25gph it says 53/4 psi and I bought a regulator from jegs a 1-4 psi a moon fuel block and gauge to set this up. But when I talked to Carter they said if I dead head that pump it would burn up and to run a return line right from the outlet to the inlet and then a pressure drop would happen and I could run straight to the carb. How picky is the strombergs with that 2.5 psi. Because your saying your not running a regulator but I don't know what pump you are using.

 

Down hill, up hill doesn't matter as long as the fuel in the tank is higher than the inlet on the carb. Sounds like your float is set to low. I ran gravity feed for years no problem.

 

my avatar sits level and has no problem going 65 MPH

 

I was just reading about the float bowl and it said the adjustment is between 15/32 and 17/32 maximum. Is this something that I can open up and bend the tab on the float and draw more fuel or is this measurement really strict

 

Your avatar?

 

I would at least check the float to see how close to specks it is. If it's okay then I'd look to see if the gas line is clogged some. Disconnect it and let it flow into a container and see if its consistent or if it slows down after running for a while.

 

I was running an Edmonds air cleaner with a paper filter and I took it off today and put in a bug screen and changed the carb to the winter setting and the car seemed to run out in third gear about 55 mph it began to sputter and act like it was doing when it couldn't breath. But for now I think it was that filter. I am thankful for your responses I can use all the help I can get

 

my set up sits lower than the fuel Outlet. The intake is unknown manufacturer but if I'm going up the hill and have less than quarter tank it'll run out of gas

 

I run a Weber carb and manifold on my B Diamond block and 6-1 head. Gravity feed. They are low like @wheeltramp brian and no lack of fuel in my '31 coupe. I also added a steel angle plate bolted to the exhaust manifold that is against the bottom of the intake to keep it from icing the carb and intake manifold.

Dave

 

Icing the carb?
mp brian, post: 14491265, member: 116069"] View attachment 5408431 View attachment 5408432 View attachment 5408433 View attachment 5408434 my set up sits lower than the fuel Outlet. The intake is unknown manufacturer but if I'm going up the hill and have less than quarter tank it'll run out of gas[/QUOTE]
The fuel is tough when you working with gravity feed on a downd

 

The fuel is tough when you working with gravity feed on a downd[/QUOTE]

You've never had a carb or intake ice up on you? Pretty common on old stuff without heated intakes like stock Model A for instance. They don't have that problem because the intake is bolted to the exhaust manifold for heat.

Dave

 

The fuel is tough when you working with gravity feed on a downd[/QUOTE]
I've ran mine on the hills a few months ago below 1/4 tank and didn't have an issue, now much below that I would be worried... I think it really depends on the % grade and how long the hill is and load also... Yeah some hills can be a problem.... Running the fuel level higher is the resolve for most of us.

 

I've ran mine on the hills a few months ago below 1/4 tank and didn't have an issue, now much below that I would be worried... I think it really depends on the % grade and how long the hill is and load also... Yeah some hills can be a problem.... Running the fuel level higher is the resolve for most of us.[/QUOTE]
I'm starting to see that as well keeping the tank full but it's a horrible fix. I'm thinking I might redo the lines in 3/8 and see if I can get enough fuel on that very too end

 

You've never had a carb or intake ice up on you? Pretty common on old stuff without heated intakes like stock Model A for instance. They don't have that problem because the intake is bolted to the exhaust manifold for heat.

Dave[/QUOTE]
As sort of a new comer to this hot rodding world I have not experienced that but I see that the original intake was testing flat against the exhaust manifold. I'd like to see a picture of that connection you made.

 

I'm using an Airtex electric fuel pump in my 29 roadster. It has a model a engine with a police head, Tattersfield down draft intake with a Stromberg 81.

 

So no problems getting fuel at high RPM in high gear with the pump? Did you have fuel delivery issues before the pump? Summer or winter setting on your carb? And how are you regulating fuel pressure

 

No fuel issues in

No fuel issues in high gear. Using a pressure regulator set a 2 pounds. Never tried to gravity feed it.

 

Please send me a video of that sucker running, I’m completely forgot about that header!!

 

It’s simple.. buying an Aluminum Cam Cover from Bangers Modified solves everything!

 

I guess me buying two has put my bangers in check for zero issues now. haha

 

I need the finned one. Polished of course. Who were you asking for a video from me ?

 

You bought two and I have none brother lol