Walbro 400LPH Fuel Pump Modification
Oct 7, 2011, 10:12 AM
#1
Evolving Member
Thread Starter
iTrader: (62)
Join Date: Nov 2009
Location: Washington D.C.
Posts: 285
Likes: 0
Received 0 Likes
on
0 Posts
Walbro 400LPH Fuel Pump Modification
Parts needed:
First here is a close up of both pumps, you can see that they are almost identical in length, but width is where they differ.
So, it's not exactly a step, but prep work includes removing the fuel pump canister and draining it of gas. I'd hate for you to dremel the thing and gas flow constantly.
Just so you don't forget, salvage the black rubber gasket from your stock setup and put it on the new pump.
Now we are ready. You need to dremel the pump's cylindar so the wider base will fit. There are many arguments over what is best, above the first tabs, or under. I didn't want to take the risk, so I used the dremel to the bottom under the clips. Here is a photo:
Before we push the pump in, there's two steps I recommend. First, install the install harness.
Second, put the 10" clamp within the setup.
Now, you are ready to slide the pump in. Make sure you connect the harness to the top of the pump, and arrange the clamp so it is positioned in the middle of the pump.
Torque down the clamp to a moderate level. Not too tight, but tight enough so that the pump will not slip. Once torqued, I choose to weave the excess thread for visuals.
The pump should now be extremly sturdy, and will not slide.
Clip on the filter, and you care finished. Congrats, you have an amazing fuel setup for a cheap price.
FPR's and re-wire setups are not required, but are recommended.
- 10" Clamp
- Walboro 400LPH Pump
- Install Kit
- Wrench Set
- Dremel
First here is a close up of both pumps, you can see that they are almost identical in length, but width is where they differ.
So, it's not exactly a step, but prep work includes removing the fuel pump canister and draining it of gas. I'd hate for you to dremel the thing and gas flow constantly.
Just so you don't forget, salvage the black rubber gasket from your stock setup and put it on the new pump.
Now we are ready. You need to dremel the pump's cylindar so the wider base will fit. There are many arguments over what is best, above the first tabs, or under. I didn't want to take the risk, so I used the dremel to the bottom under the clips. Here is a photo:
Before we push the pump in, there's two steps I recommend. First, install the install harness.
Second, put the 10" clamp within the setup.
Now, you are ready to slide the pump in. Make sure you connect the harness to the top of the pump, and arrange the clamp so it is positioned in the middle of the pump.
Torque down the clamp to a moderate level. Not too tight, but tight enough so that the pump will not slip. Once torqued, I choose to weave the excess thread for visuals.
The pump should now be extremly sturdy, and will not slide.
Clip on the filter, and you care finished. Congrats, you have an amazing fuel setup for a cheap price.
FPR's and re-wire setups are not required, but are recommended.
Last edited by REV.olution; Oct 10, 2011 at 03:15 PM.
Oct 15, 2011, 09:26 AM
#7
Evolving Member
Thread Starter
iTrader: (62)
Join Date: Nov 2009
Location: Washington D.C.
Posts: 285
Likes: 0
Received 0 Likes
on
0 Posts
I choose this clamp because I believed it would not only hold onto the pump well but provided a good barrier to protect pump slipping.
You probably can, I just had an aftermarket setup and thought it would be a better safety barrier. I can't promise you anything, you may have to ask an expert
You probably can, I just had an aftermarket setup and thought it would be a better safety barrier. I can't promise you anything, you may have to ask an expert
Trending Topics
Oct 17, 2011, 09:31 AM
#9
Evolving Member
Thread Starter
iTrader: (62)
Join Date: Nov 2009
Location: Washington D.C.
Posts: 285
Likes: 0
Received 0 Likes
on
0 Posts
Yeah, I can't vouch for it cause I've always had my AEM FPR, I'm sure the stocker can hold up. Nevertheless, adjusting FPR on the fly is always a treat.
Oct 18, 2011, 08:45 PM
#10
If there is a problem with the stock FPR with this pump it will likely be that the idle/low load fuel pressure will be too high. If thats the case it's going to make tuning difficult without an aftermarket adjustable FPR to reduce the fuel pressure.
Oct 19, 2011, 06:22 AM
#11
Evolving Member
iTrader: (12)
Join Date: Jul 2006
Location: Pittsfield/philly
Posts: 166
Likes: 0
Received 0 Likes
on
0 Posts
Just did mine last night, also did the rewire, while i don't have a fuel pressure gauge in i logged some of my fuel trims at cruise and idle and so far they seemed to remain the same at cruise and idle. (still using the stock fpr) I will let you know if anything changes this afternoon. I am also quite amazed on how quiet this thing operates, cant hear it whatsoever
Last edited by turbotekray; Oct 19, 2011 at 06:32 AM.
Oct 19, 2011, 07:22 AM
#12
Just did mine last night, also did the rewire, while i don't have a fuel pressure gauge in i logged some of my fuel trims at cruise and idle and so far they seemed to remain the same at cruise and idle. (still using the stock fpr) I will let you know if anything changes this afternoon. I am also quite amazed on how quiet this thing operates, cant hear it whatsoever
Oct 19, 2011, 09:29 AM
#14
Just did mine last night, also did the rewire, while i don't have a fuel pressure gauge in i logged some of my fuel trims at cruise and idle and so far they seemed to remain the same at cruise and idle. (still using the stock fpr) I will let you know if anything changes this afternoon. I am also quite amazed on how quiet this thing operates, cant hear it whatsoever
