diesel fuel flow rates 12HT, 1HZ, 2L, 3B etc

[2rivers]

Hi all,

Pondering a new project and looking to get some info on approx figures for aftermarket filter sizing, flow capacity, in-line electric fuel heaters etc -> looking at a WVO system install for spring/summer use. I'll start it now cause it will take me ages to finish!!

I'd appreciate knowing what flow rates for 2L, 1HZ, 12HT and 3B diesel inj pumps in L/min or mL / sec. Would approx say 30%?? go back to the tank by return line. YOur thoughts would be appreciated!

cheers,
Johnny

[brownbear]

Hi Johnny,
any filter set up should IMOP be suffcent.

I think about my 3b for example. On the highway it burned about 10.5 litres per 100 k at 100 kph. So in one hour 11 or so litres.

Gallons per hour or minute is how most filters are rated. Think the thirstiest of the engines might be 20 litres per 100 k.

So that would be in the neighbourhood of 4 gallons per hour.

Does that help you figure out the flows?

Personally in a WVO I have figured I want a 30 micron filter for the first stage, then a 10 micron for prior to the fuel pump. And to help keep the fuel system form becoming a vacuum with the filters, I would put a tank area pump of low pressure. Like 5 psi. To overcome the vacuum...


Anyhow that's my winter brainstorming...

I was out for drive today and saw your wife in the 60... Reminded me I have a tailgate for yah.

Cheers!

[M John Galt]

For the B series engines, the manual states the minimum discharge volume of the fuel feed pump at 1000 RPM is:
900 cc/min, 54.9 cu in/min, ~ 14 gallon/hr. That's the volume through the fuel filter and IP.

The best location to introduce hot VO fuel is before the fuel feed pump and the filter, using a separate fuel feed pump for the hot VO. Solenoid valves can be used, but a separate fuel feed pump upstream of the VO fuel heater will last longer and operate more reliably and simple check valves ensure that either fuel won't back feed into the other tank. I run a 10%VO mix in the main tank year round and higher percents in the summer.

[roscoFJ73]

The overflow volume for a 1HZ at 2000 rpm is 366 - 800 cc/min which is 22-48 ltr per hour . That is the amount of fuel pumped back to the tank.
The high amount of overflow is to keep the fuel and the pump at a constant temperature. The FSM recommends testing the rotary pumps with a fuel temp of 40-45c which I presume is also their ideal operating temperature.
The flow is adjusted by the overflow screw.
The fuel pump also needs an internal pressure of 7.1-7.7 psi which is adjusted via the regulator valve .
Fuel feed pressure to the pump should be 2.8 psi

To accomplish all this your gonna need the gauges to plug into the pump,the fuel line and bench testing equipment to replicate engine rpm .


The inline pumps on the 2H 12HT and B engines is probably totally different set up.

[brownbear]

this guy has all those engines listed above...... so lots of testing

[Tapage]

Interesting info guys ..

When I buy my electric pump I found mine from 7 - 9 PSI and other one 14 - 16 PSI for " diesels " but this PSI it's related to the flow rate ..

[2rivers]

Hhhmmm interesting.

AWESOME info guys - really appreciate it. I feel badly about posting (I was lazy not diggin through the manuals), but some great side info always seems to come out of threads like this (as demonstrated). Brownbear I would like to run some ideas past you at some point I can call U if you like. I'll try to keep this post alive as I go...

[roscoFJ73]

Im surprised at M John Galts info . I imagined the inline pumps would have drawn less fuel than the rotary.
14 Gallons is 63 litres and if it burnt say 10 litres an hour that would mean it's sending 53 litres back per hour through the filter(the B engines dont send their fuel back to the tank).

[brownbear]

Originally Posted by roscoFJ73

Im surprised at M John Galts info . I imagined the inline pumps would have drawn less fuel than the rotary.
14 Gallons is 63 litres and if it burnt say 10 litres an hour that would mean it's sending 53 litres back per hour through the filter(the B engines dont send their fuel back to the tank).

yah but on a 3b it doesn't return to the tank, it cycles around the IP, and it doesn't refilter the cycling fuel. It only gets filtered once.

SO a firewall filter or WVO filter would not have to have anymore flow that what you burn.

[brownbear]

Originally Posted by 2rivers

Hhhmmm interesting.

AWESOME info guys - really appreciate it. I feel badly about posting (I was lazy not diggin through the manuals), but some great side info always seems to come out of threads like this (as demonstrated). Brownbear I would like to run some ideas past you at some point I can call U if you like. I'll try to keep this post alive as I go...

I'll call next Sat. Might be nice to go for a drive and drop the t-gate at your place. We get the locked up feeling in the house with 3 kids....

[M John Galt]

Originally Posted by roscoFJ73

Im surprised at M John Galts info . I imagined the inline pumps would have drawn less fuel than the rotary.
14 Gallons is 63 litres and if it burnt say 10 litres an hour that would mean it's sending 53 litres back per hour through the filter(the B engines dont send their fuel back to the tank).

The data comes from the B series engine manual, it's not my info.

The 13B-T returns the fuel to the tank.