Flexfuel pump swap into non Flexfuel NNBS ???
04-05-2013, 09:40 PM
#42
TECH Enthusiast
iTrader: (3)
Join Date: Sep 2009
Location: Lee's Summit, Mo
Posts: 653
Likes: 0
Received 0 Likes
on
0 Posts
True, it only had 30,000 on it. I'm planning on it being trouble free for many many boosted miles, but I'll always keep my eye on fuel pressure and AFR.
09-07-2013, 02:58 PM
#43
TECH Apprentice
Bringing this back to life, How are those pumps holding up?
I was doing some research on fuel pumps for my upcoming turbo install and came across this thread. I did some searching and it seems that the pumps you guys are using(MU-1847) are not actually flex fuel pumps. The part number i found for a flex fuel pump is AC Delco # MU-1560. Its being listed to fit 2007-2008 models. It seems that the pumps you guys got are working, so I'm wondering if there is really any difference in the pumps themselves or what is different between the two. Any one have any ideas?
I was doing some research on fuel pumps for my upcoming turbo install and came across this thread. I did some searching and it seems that the pumps you guys are using(MU-1847) are not actually flex fuel pumps. The part number i found for a flex fuel pump is AC Delco # MU-1560. Its being listed to fit 2007-2008 models. It seems that the pumps you guys got are working, so I'm wondering if there is really any difference in the pumps themselves or what is different between the two. Any one have any ideas?
09-07-2013, 05:56 PM
#44
TECH Enthusiast
iTrader: (3)
Join Date: Sep 2009
Location: Lee's Summit, Mo
Posts: 653
Likes: 0
Received 0 Likes
on
0 Posts
I don't know the difference. However the flex pump I swapped in is losing pressure at 13 psi. 
Looks like I'll be looking into a Walbro 400/450 or two pumps feeding together.
Looks like I'll be looking into a Walbro 400/450 or two pumps feeding together.
10-30-2013, 07:25 PM
#45
Registered User
Join Date: Oct 2013
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
did you ever do the swap? I was looking at the 255 or 340 and I wasn't able to find one that fit a 2007 5.3. someone had said on my thread that they weren't compatible with the 2007+. do you know if it is only the 400/450 that work?
10-30-2013, 07:29 PM
#46
Registered User
Join Date: Oct 2013
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
do you know if that one has a higher lph than a flex fuel? or what the lph is for that matter? also how did it hold up for you?
11-01-2013, 08:04 AM
#47
TECH Enthusiast
iTrader: (3)
Join Date: Sep 2009
Location: Lee's Summit, Mo
Posts: 653
Likes: 0
Received 0 Likes
on
0 Posts
I haven't made a change yet, still on the same flex pump I swapped in, student loans are consuming all of my disposable income.
Byrdman on here just swapped a 450 into his truck and it appears to be working.
Byrdman on here just swapped a 450 into his truck and it appears to be working.
