Belt drive fuel pump question

Bracket Talk

This topic can be found at:
https://drr.infopop.cc/eve/forums/a/tpc/f/80760912/m/5287096186

September 08, 2018, 10:55 AM

Bucky

Belt drive fuel pump question

quote:
Originally posted by Dave Koehler:
Saturday morning, it's raining, the European finals from Santa Pod is streaming and this happened.

Carb pondering.
IF large fuel bowls could contain enough fuel to complete a run would this eliminate the need for a fuel pump?

Could this also eliminate floats and needles and seats?

Just mount a fuel tank on either side of the carb. LOL.

September 08, 2018, 11:01 AM

speedwrench44

Need to do what I do when idea pops up, lay on couch till it passes LOL

September 08, 2018, 05:25 PM

Dave Koehler

There is that.

Dave Koehler - Koehler Injection - http://www.koehlerinjection.com
Fuel Injection - Nitrous Charger - Nitrous Master Software - Balancing
99% of fuel injection problems are electric.

September 10, 2018, 09:06 AM

speedwrench44

Thanks for the help guys. Got 3 passes friday night. 6.50 setup. 4.5# idle pressure, 8# wide open First pass was .09 60ft(yeah, sure) 5.80 at 97mph coasting thru (believe that 5.80 too). Front float set too low, ran out gas.
Next two were 6.45's, no hesitation or burbling, came on 2 step clean.
Looks like it's fixed, thanks again

September 10, 2018, 09:28 AM

Curly1

quote:
Originally posted by Dave Koehler:
Saturday morning, it's raining, the European finals from Santa Pod is streaming and this happened.

Carb pondering.
IF large fuel bowls could contain enough fuel to complete a run would this eliminate the need for a fuel pump?

Could this also eliminate floats and needles and seats?

No you would still need fuel pump, needles and seat. The float level changes how much fuel goes into motor. The higher the float level the less it has to suck to draw the fuel into motor. So A lower float level = leaner.

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September 10, 2018, 11:57 AM

Dave Koehler

Curly,
It's not injected.

Dave Koehler - Koehler Injection - http://www.koehlerinjection.com
Fuel Injection - Nitrous Charger - Nitrous Master Software - Balancing
99% of fuel injection problems are electric.

September 12, 2018, 07:31 AM

speedwrench44

Dave, when the bowl runs empty, it gets leaner, trust me

September 12, 2018, 07:36 AM

Dave Koehler

of course it does.
My oddball scenario was IF there was a big enough bowl to supply a whole run would all the other stuff be needed? In other words enough volume to keep the jets covered up.

Dave Koehler - Koehler Injection - http://www.koehlerinjection.com
Fuel Injection - Nitrous Charger - Nitrous Master Software - Balancing
99% of fuel injection problems are electric.

September 12, 2018, 08:35 AM

Lenny5160

quote:
Originally posted by Dave Koehler:
of course it does.
My oddball scenario was IF there was a big enough bowl to supply a whole run would all the other stuff be needed? In other words enough volume to keep the jets covered up.

I don't know about eliminating the NEED for that stuff, but I do know that the tuneup (according to the engine) does change based on fuel pressure to the bowls.

September 12, 2018, 12:14 PM

Dave Koehler

you mean atmospheric pressure don't you?

Dave Koehler - Koehler Injection - http://www.koehlerinjection.com
Fuel Injection - Nitrous Charger - Nitrous Master Software - Balancing
99% of fuel injection problems are electric.

September 12, 2018, 12:33 PM

Lenny5160

quote:
Originally posted by Dave Koehler:
you mean atmospheric pressure don't you?

Call it what you will, but on the dyno my engine's output will change simply by changing the pressure up or down on my BLP internally-regulated belt pump. I assume that the bowls have sufficient volume for all pulls.

In your theoretical, the engine would just be taking what it needs without a push, although force could be influenced by the amount of fuel in these bowls and placement of the jets within them.

September 12, 2018, 12:36 PM

Dave Koehler

Weight/volume of the fuel has something to do with it for sure.

I would think that if the float does it's job, the bowl has enough capacity and the pump supplies the required amount that the volume/weight would stay the same. Guess not.

I am just waiting for someone to put a sensor on the bowl itself and tell me what they see.

Dave Koehler - Koehler Injection - http://www.koehlerinjection.com
Fuel Injection - Nitrous Charger - Nitrous Master Software - Balancing
99% of fuel injection problems are electric.