High Volume Fuel Pump

[Fleecer]

What's the best high Volume Fuel pump out there? Had good luck with Walbro years ago, but as of late, I haven't had good luck.

Is there a better pump out there?

Anyone try and AEM?

 

[fatchance]

Funny you should mention that Glenn, i had to return a new Walbro GSS342 pump last year that was DOA and now this year with the new 25' build another Walbro GSS342 pump went flat on its face today on the trail. Key on zero pressure. Troubleshooted it and the only suspect wiring i could find was the OEM plug on the harness which to me felt a little loose. I am only using that plug as the trigger for a relayed power source direct from the battery. Sled ran back to the cabin, but I'm really not convinced it was the harness. I think the pump is the culprit.

 

[Fleecer]

I've put 3 Walbros this winter. They dont make 75 miles, and start missing. I've been buying them on Amazon part# GSS342. Is this my problem?

I called Hurricane and asked what brand of pump they use. I was told AEM 340 LPR pumps, so I ordered one. When it arrived, it said, "Made in China" on the box. Nothing stamped on the pump. I was not impressed, but installed it anyway. Sled ran great for 16 miles, then I let off the throttle for a turn and sled died. FPR was at 0. Priming the pump several times, sled would finally start. I did this another 20 times throughout the day.

When running, sled would not pull rpm, would cough and backfire. Datalog showed closed loop at 125% and AFRs at 25 during these occurrences. Another bad pump.

My first Walbro pump lasted 9500 miles, now I can't last a day. Is there a disadvantage to going higher volume? Instead of 255 LPR, should a guy go 400 LPR? Will higher volume empty the slipper and lead to problems?

 

[fatchance]

Well I think there's allot of junk(knockoffs) on Amazon these days so I have been buying mine straight from Walbro. They had no problem replacing the pump last year when it happened, but the inconvenience with replacing parts is hard to bear. Auto part failure rates these days is pathetic, just ask any mechanic!
As far as a bigger pump goes, i don't think there would be any benefit over and above that 340LPH pump and even that pump is providing allot more fuel than these 300hp plus tunes require. The FPR800 would certainly handle that flow as it's limit is 831LPH, but there's more to consider pushing all that fuel through the rails and back to the tank.
Sounds like you've had very similar symptoms to my scenario yesterday. Did you ever flow test the pumps after removing them? Maybe it is that chintzy plug that comes off the harness and powers the pump? I was contemplating cutting that out of the system and replacing it with a better quality connector.

 

[Fleecer]

Well I think there's allot of junk(knockoffs) on Amazon these days so I have been buying mine straight from Walbro. They had no problem replacing the pump last year when it happened, but the inconvenience with replacing parts is hard to bear. Auto part failure rates these days is pathetic, just ask any mechanic!
As far as a bigger pump goes, i don't think there would be any benefit over and above that 340LPH pump and even that pump is providing allot more fuel than these 300hp plus tunes require. The FPR800 would certainly handle that flow as it's limit is 831LPH, but there's more to consider pushing all that fuel through the rails and back to the tank.
Sounds like you've had very similar symptoms to my scenario yesterday. Did you ever flow test the pumps after removing them? Maybe it is that chintzy plug that comes off the harness and powers the pump? I was contemplating cutting that out of the system and replacing it with a better quality connector.

Never flow tested them, but they become really noisy like they have 10,000 hours.

I just ordered one direct from Walbro. I guess this is the only way to guarantee it is genuine!

Oddly and worth mentioning: After installing the Hurricane 340LPR pump, the sled picked up 200 rpm and was an absolute animal. I was stoked and thought I discovered the ultimate secret......and then the sled died. My dreams were shattered!!! Lol

 

[KnappAttack]

Could the reason you’re eating pumps have to do with the pieces you’ve found in the tank perhaps Glenn? Not that they’re being eating thru the pump but because something is not working as designed.

 

[Fleecer]

Could be Mike, however the socks and filter in the slipper did not appear dirty.

Maybe at next pump replacement I should run carb cleaner through these filters and check for debris??

Should I go out on a limb and change the two socks? I'm open to any opinions.

 

[Fords4life]

Have had good luck with Deatschwerks fuel pump #9-401-1046 also i clean my fuel sock and crows feet with carb cleaner before each season.

 

[sideshowBob]

This conversation makes me question whether we really need to change the OEM fuel pumps? Most of us have upgraded our tuned 998s fuel pumps to a high volume unit but has anyone ever determined the stock pump is inadequate for a 300 tune?
Makes me wonder....
I guess, with data logging and closed loop, a person could reinstall the stock pump and see if the fuel correction of the closed loop gets maxed out.

 

[Turboflash]

It's a foregone conclusion that if we ask someone who sells larger pumps IF the stock pump can handle 300HP they'd all say 'no.' That said, I've been told the stock pump becomes marginal starting at about 280HP level. Certainly should not be used higher than that.
I purchased the PEFI fuel pump upgrade kit years about 4 years ago. I think he uses a 255 lph pump. When I did the calculations using stock fuel injectors at full flow, even that 255 lph pump can pump way more fuel than the injectors can flow, which means there is still a huge return to the basket keeping it full and overflowing all the time.
Some of us have added an in-line 10 micron fuel filter to our systems making certain nothing can clog up the pump or the suction socks, etc.
I've also had my injectors ultrasonically cleaned and flowed to make sure they're at 100%.
So far, no issues with my PEFI pump and fuel filter. Also, good idea to run the pump directly off battery using the Boost Kinetics relay accessory.
PEFI also has larger tank suction screens if you want. Don't know whose pump they use. Kit is expensive but it's a really nice quality kit.
BTW- no, I don't work for PEFI but their hardware is the best around IMHO.
But if the pump won't keep running right, no one's pump is any good. JM2C

 

[Fleecer]

This conversation makes me question whether we really need to change the OEM fuel pumps? Most of us have upgraded our tuned 998s fuel pumps to a high volume unit but has anyone ever determined the stock pump is inadequate for a 300 tune?
Makes me wonder....
I guess, with data logging and closed loop, a person could reinstall the stock pump and see if the fuel correction of the closed loop gets maxed out.

Great question....as far as TD Tunes go, Max 17 and higher require big pump to keep knock at bay. Running some race fuel with stock pump will get you by, but in the end, it is more cost effective to run big pump on pump fuel imo.

 

[Fleecer]

Have had good luck with Deatschwerks fuel pump #9-401-1046 also i clean my fuel sock and crows feet with carb cleaner before each season.

That pump is 415LPH? Who's tune are you running?

 

[REDLINE 1]

Have had good luck with Deatschwerks fuel pump #9-401-1046 also i clean my fuel sock and crows feet with carb cleaner before each season.

You actually see any crap wash out when u clean them?

 

[REDLINE 1]

Have had good luck with Deatschwerks fuel pump #9-401-1046 also i clean my fuel sock and crows feet with carb cleaner before each season.

You actually see any crap wash out when u clean them

Been using a wahlbro 190lph for years now on ms17 with no problems. My TD dealer says it should be good to 300

 

[Turboflash]

I run Hurricanes high volume pump, adjustable fuel regulator, rerouted return line, closed loop, well vented fuel tank, relayed direct to battery pump connection and the closed loop is still adding fuel on the 300 tune as my data logs show.
What if a person just upped the fuel pressure on stock pump, with closed loop.?
I wonder if enough fuel pressure might do it?


View attachment 177919

Be easy for you to find out with your adjustable FPR.
Makes me wonder just what all goes into creating a closed-loop map? What is target AFR? What else do they factor in? What muffler? What air intake? At what IAT, what coolant temp, what humidity, what barometric pressure, what boost, etc?