fuel pump

[snopro75]

My 11 m8 is loosing all fuel pressure couple minutes after shutting it off. It's not leaky injectors as i capped the line after the psi guage and it still lost psi after cranking a few times. The pump was not submerged in gas all summer like i've read they should be. Are there any brands of pumps that i should stay away from? Looking at the walbro or quantum. Are they the same pump just rebadged? Better options? Not buying the cat pump.....

edit:

QFS Fuel Pump w/ Strainer for Arctic Cat Snowmobile - EFI In-Tank OEM Replacement, HFP-404

FREE SHIPPING, LIFETIME WARRANTY from the AUTHORITY on OEM replacement Fuel Pumps. SAVE up to 70% off on parts for your Arctic Cat 00-17 with HFP-404

www.highflowfuel.com

WALBRO GSC404 EFI Fuel Pump Arctic Cat M 5 2006, Replaces Arctic Cat 1670-851, 1670-421, 1670-781

Walbro # WAL-GSC404 - Genuine Arctic Cat /WALBRO GSC404 EFI Fuel Pump M5 2006 - <div...

www.highflowfuel.com

 

[kiliki]

Cat uses the walbros pump. Is it the bypass spring on the pump?

 

[snopro75]

bypass spring...googling now. thanks for the tip.

 

[snopro75]

Ok, I have the bdx adjustable regulator on it. I will pull pump tomorrow. Maybe get lucky and the little o-ring is trashed.

 

[hansenmac]

only buy the walbro. i just had to put a pump in an 01 mtn cat and got a pump from the fuel pump factory and it pulled too many amps and wouldnt provide full pressure. then put in a genuine walbro and it works perfect. read on a forum where a few other guys said the same thing. there is a check valve in the pump too that may be the problem.

 

[snopro75]

there is a check valve in the pump too that may be the problem.

I was wondering if that was the case. Ordered a walbro the other day. Will report results.

 

[snopro75]

Update: So i put the new pump in and cranked what seemed like forever and it would sputter every 5th ish pull. Buddy looked in tank while cranking and fuel was running down all over pump. Pulled pump and decided the little pc of 5/16 fuel line between the pump and pump housing wasn't sealing good (new pump don't come with one and not listed in parts diagram). Installed new piece and sled started on 2nd pull. Runs normal pressure at idle. Problem is pressure drops to 0 fast after shutting it off and i'd swear it used to hold pressure. Starts first pull even from 0 psi though. When i shut it off i can see in the tank the bdx regulator dumping the pressure. I put the bdx on last yr and maybe this is normal. Ideas??? Normal run it or regulator is screwed up? Thanks

 

[snopro75]

Update: So i put the new pump in and cranked what seemed like forever and it would sputter every 5th ish pull. Buddy looked in tank while cranking and fuel was running down all over pump. Pulled pump and decided the little pc of 5/16 fuel line between the pump and pump housing wasn't sealing good (new pump don't come with one and not listed in parts diagram). Installed new piece and sled started on 2nd pull. Runs normal pressure at idle. Problem is pressure drops to 0 fast after shutting it off and i'd swear it used to hold pressure. Starts first pull even from 0 psi though. When i shut it off i can see in the tank the bdx regulator dumping the pressure. I put the bdx on last yr and maybe this is normal. Ideas??? Normal run it or regulator is screwed up? Thanks

edit: pulled regulator off and could blow through outlet easily. Took apart body and everything appeared normal. Put back together and could not blow through outlet. Thought it was fixed but still drops fast to 10 then slowly to zero. Afraid to peel the diaphram looking thing off as i will prob ruin it.

 

[jim]

Almost sounds like a debris issue. Have you tried soaking in a solvent like seafoam? Or adding that to gas and giving it some time?

 

[snopro75]

In closing this thread i did peel off the diaphram in the bdx regulator and didn't break it. I believe the leakage was between the brass regulator plunger and the housing it seats on. It's a metal/metal seal that had small leakage. Installed a 5/16 in line check valve and holds psi now.