Help: fass 150 flow thru?

Dirtymaxx03

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Aug 4, 2009
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Are the fass 150 (no filters) lift pumps a flow thru design? Mine has started pouring fuel pretty good when its running, if its a flow thru pump (and wont cause a fuel limp on a small tune) then i want to remove the fuse and go about my bidness. If its not a flow thru then im just gonna bypass the pump till i can fix it
 

Chevy1925

don't know sh!t about IFS
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Oct 21, 2009
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I drove mine for 2 days with my adII 165 off and didnt know it lol. i just drove her normal though, no racin around.
 

Dirtymaxx03

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Aug 4, 2009
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I drove mine for 2 days with my adII 165 off and didnt know it lol. i just drove her normal though, no racin around.

i pulled the fuse and it drives, havent tried to get up to hwy speeds tho. it shouldnt leak if the pump isnt on right? knowing me i'd be driving around on a tiny tune with no lift pump for a couple weeks while its still pouring fuel.
 

Dirtymaxx03

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Aug 4, 2009
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the little weep hole (i guess thats what it is) on the bottom of the pump. I noticed my mpg's dropped a decent amount around the same time i got the 20's and larger tires. but thats also about the time my lift pump started being a *****. Today was the first time i've actually seen it leaking...

i wonder if they offer some rebuild kit for these? it might just need cleaned real good
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
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Phoenix Az
oh got ya. i couldnt say if it would leak or not. your best bet would be to bypass it just so your not drawing air in or loose prime
 

Dirtymaxx03

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Aug 4, 2009
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Post a pic how olds the pump?

pump is like 2.5 years old. The past 5 or so months it has been screaming. I got the pump off and bypassed it (i lose rail pressure on my tow tune anything above 70mph now lol). I took the pump apart and it was full of dirt and debris. So i am going to clean the chit out of it and hope it will work for a little longer. I'll post some pics later