Fuel Flow Question???
 

Should my fule flow:

A.
Tank->MainLine->Pump->Filter/Water Seperator-> Carb

or


B.
Tank->Main Line-> Filter/Sperator->Pump->Carb


Its been apart so long i can't remeber how to hook it up again!!!
Additionally where can i buy decent fule line with the nice fittings so i don't have to use those crappy clamps???

Option A is best...
 

...because pumps don't like to "draw", but alot of guys run them that way.

I got all my fittings and hose from Summit. Good prices if you don't mind putting them togther yourself.

B Tank, filter, pump, carb.

You may want a post filter between pump and carb though.

This is the way mine is.

What Ray said.

Puder, I will talk to you beginning of next week

excellent!!! thanks.

i will be leaving for ohio on thursday noght of next week so giveme aring before then. SCCA runnoffs come but once a year :D

fuel pressure sender? I have a small PSI gauge now at the carb but where sould i put the sender for the guage on my dash? I was thinking it shoudl be as close to eth carb as possible so it will give me the actual pressure reading of wat is getting to eth carb. It for a blower motor (basically a SC525) so fuel PSI is pretty important.

Yep, l always go the last stop in the system. I have used a Dominator bowl in the past as it is tapped on both sides for an inlet fitting, then put the gauge on the other side of the bowl.

Here's how I'd plumb it...naturally I didn't. ;)

Tank -> check valve -> coarse prefilter -> pump -> merc filter/separator -> return regulator -> carb

The check valve is meant to help the pump to mantain prime. This would not be a issue if the pump was mounted below the tank floor.

The manufacturer of the pump can tell you what micron the prefilter would need to be. I'd be guessing around 40 micron.

Be sure to wire the pump with a relay so that it sees full voltage.

Drill and tap the merc separator to 3/8". I have this filter after the pump as it's slightly restrictive and the pump will be more efficent at pushing the fuel through it.

Several people have mentioned problems with the pump over heating a nd pressure creap at idle with out a return style regulator.

I'd run -8 for all lines up to the regulator and -6 after. Yes, the line is slighly oversized, but there are friction losses that need to be accounted for. Don't use those cheasy chrome carb fuel lines. Get a good AN one. And please don't use rubber. AN braided is the only way to go.

oh i forgot to mention its not an electric fuel pump

Cord:

You've got it right for an electric pump, I would add an oil pressure sender in line so the pump won't run without oil pressure. I use an 8 micron filter before my fuel pumps. The last thing you'd have to look at is vent size. If your tank vent is not large enough that too can overheat a large electric pump.


Doug