sgieldon

Interesting problem here?
I changed out my Fuel Pump again for a Higher Flow 110gph @Max 9psi Regged down to 6psi for the RB Holley.
Now I have blown out 2 Fuel Filter Gaskets in 25miles.
Weird.
As seen below this is a High Flow & Performance Fuel Filter.
Nothing is Plugged and everthing else checks out OK.

I don't need alot of check this or check that.
Just curios if anyone had this happen to them with there whole Fuel System Upgraded???
Thanks
steve
sgieldon

dj55b

iTrader: (2)

i don't have an answer but i came here in hopes of seeing something for my setup. How many micron filter should we be using roughly?

Kentetsu

Any chance that the filter is getting too dirty to pass enough gas to meet the draw from the pump? Otherwise, maybe you could go with a dual filter setup like I did...

trochoid

iTrader: (6)

Just a guess, but your fuel volume may be too much for the system since you are not running a return line. Use a return style fpr after the carb, that may solve the problem. When you get into the 110 gph range on fuel pumps, you usually need a 5/16" return line at a minumum. My Mallory Comp 140 requires a 3/8" return line, thier 110 gph needs a 5/16" one. I've run 3/8" line for both supply and return and am still having problems.

craigw1

nice engine bay. I take it your 12a is street ported ?

blwfly

iTrader: (4)

^its a 13b 1/2bridge medium streetport if rember right

damn thats nice cant wait to see the beast
give me a pm steve if your home...

dj55b

iTrader: (2)

Thats the same pump that i'm using right now ... without fuel pressure regulator and having little problems too .. how many psi do you have it set at right now?

trochoid

iTrader: (6)

I'm running a Mikuni with the fuel pressure set about 5 psi using the Mallory 4309 return style fpr. If you are not running a return line, you will continue to have problems and the pump may not last long. The stock fuel lines are too small, both supply and return for the 140, barely adequate, if that, for the Comp 110.

I don't know why I bought such a big *** pump, other than the fpr came with it. I have less than 3k miles on it and am finished screwing with it. The 110 gph pump puts out more fuel than a 350 hp TII engine needs.

If you are going to run the 110 or 140 gph pumps, you have to have a return line and a return style regulator, there is no getting around it. Unless you are running 275 hp and up, the 70 gph pump is more appropriately sized. The Walbro 255 lph intank pump is an upgrade for the TIIs, converting the Comp 70 to lph, it puts out 265 lph.

sgieldon

Thanks all for the Inputs.
I'm leaning toward the (To much GPH and no Return Line hooked up).

I have the Aeromotive #13205 5-12psi FPR adjusted @ 6psi w/no Return. Damn expensive FPR.
Is there any way to Hook up the Stock Return line to it? DeadHeaded for now.
I thought the only reason you needed the return was for FI not aftermarket Carbs.
FYI-Complete Fuel System from Tank to Carb Brand New. Well about 3700mles so far.
Any thoughts on how to getting around buying another FPR.
Thanks
Steve

trochoid

iTrader: (6)

Holleys generally don't have a return line, they also don't need that big of a pump. Instead of replacing the fpr get a smaller fuel pump, something in the 70 gph range is more than enough.

sgieldon

Trochiod;
The reason I had to install a larger flowing GPH Fuel Pump is that at Half to WOT my Re-Worked RB Holley to Pinapple Racing Engine Specs was running out of Gas.
ie Floats not keeping up with either a 40GPH or 60GPH @5-8psi Fuel Pumps.

I think I may have found the Problem Tho!
I called Aeromotive on Friday and they suggested changing out my Filtering System from 10micron to 40micron. I have both the 10 & 40micron filter elements for the Before Carb Russel Filter and am going to Bypass the Larger Filter 10micron installed before the Fuel Pump. Not to worried about that one since its all new back there.
With high flow setups this is a common problem.
Sometimes Finer is not always this best way to go.
I'll give it a shot today and let you all know if that worked.
sgieldon
steve

trochoid

iTrader: (6)

Too fine a filter may be the problem, compounded by a high flow pump. On carb applications, I don't really see a need for that fine of filtering and they can be a restriction. good call on thier part, I didn't think in that direction.

sgieldon

Sure enough (Aeromotive) was correct in the to Small Micron Filter setup.
I Bypassed the Pint in a Half Size 10micron Filter and changed out the Russel Fuel Filter to 40micron and no more leaking. And actually the car felt more aggressive in the above 4000rpm area and above.
I ordered the 40micron replacement element for the larger filter and all should be good.
Since everthing in the Fuel System is new and 3\8 im not to worried about anything getting past the Filtering System @ 40micron.
See woman had it right all these years (Bigger Is Better).
Thanks all for your inputs especially trochoid.
Happy 4th
sgieldon
steve

blwfly

iTrader: (4)

ah i thought it had to do with restriction
glad ya figured somthin
now take me for a ride...