Walbro 400 LPH Fuel Pump
10-08-11, 07:28 PM
#26
and heres the issue with using the filter that it comes with
theres no way to get that rubber spacer seat to fit in the right direction without it pushing or pulling on the filter
it won't seal to the fuel pipe right without the rubber seat at the base of the pump
theres no way to get that rubber spacer seat to fit in the right direction without it pushing or pulling on the filter
it won't seal to the fuel pipe right without the rubber seat at the base of the pump
10-09-11, 12:22 AM
#27
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i didnt say i trust it, nor did i declare its quality... maybe you confused my posts with someone elses, or you simply arent paying attention.
i only explained to you how they can make a higher flowing pump than oem for cheaper, since you thought there was no rational explanation.
i only explained to you how they can make a higher flowing pump than oem for cheaper, since you thought there was no rational explanation.
10-09-11, 12:41 PM
#28
it's a walbro so it's bound to make noise anyways... just get rid of the rubber seat base so you can clock it any direction you need to and clamp the sucker to the side bracket leg. be sure to pickup a set of earplugs cause the whining is going to drive you nuts. 
i'm starting to have a difficult time justifying even retaining the stock sender unit housing anyways. 400lph isn't going to push through the stock lines and the teeny tiny electrical pins in the junction on top of the tank are going to melt when trying to pull 30 amps through there.
these are ticking timebomb setups.
if i got your attention by saying that then hopefully i will have saved you a motor. at least lookup some of the writeups on bulkhead connectors for the housing and definitely rewiring the pump, the stock wiring is NOT going to support that much amperage for long and the voltage will dip dangerously low.
i'm starting to have a difficult time justifying even retaining the stock sender unit housing anyways. 400lph isn't going to push through the stock lines and the teeny tiny electrical pins in the junction on top of the tank are going to melt when trying to pull 30 amps through there.
these are ticking timebomb setups.
if i got your attention by saying that then hopefully i will have saved you a motor. at least lookup some of the writeups on bulkhead connectors for the housing and definitely rewiring the pump, the stock wiring is NOT going to support that much amperage for long and the voltage will dip dangerously low.
Last edited by RotaryEvolution; 10-09-11 at 12:46 PM.
10-09-11, 05:15 PM
#31
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if i got your attention by saying that then hopefully i will have saved you a motor. at least lookup some of the writeups on bulkhead connectors for the housing and definitely rewiring the pump, the stock wiring is NOT going to support that much amperage for long and the voltage will dip dangerously low.
http://www.cj-motorsports.com/catrx7twinwalbro.htm
it probably costs 2-3 times what you would spend on connectors/fittings to rig up your own upgrade... but its nice and convenient for those of us that want a bolt-in upgrade.
10-09-11, 05:44 PM
#32
CJ Motorsports makes a nice all new bulkhead that drops right in. It's built for dual pumps, but I assume you can use it with just one pump as well if you have this new 400lph or aeromotive 340lph, and leaves room to upgrade later for big power.
http://www.cj-motorsports.com/catrx7twinwalbro.htm
it probably costs 2-3 times what you would spend on connectors/fittings to rig up your own upgrade... but its nice and convenient for those of us that want a bolt-in upgrade.
http://www.cj-motorsports.com/catrx7twinwalbro.htm
it probably costs 2-3 times what you would spend on connectors/fittings to rig up your own upgrade... but its nice and convenient for those of us that want a bolt-in upgrade.
10-09-11, 09:28 PM
#33
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10-22-11, 02:51 AM
#34
Buschur racing had the Walbro 400lph tested, these are the results:
Converting the units:
13.2 volts test
40 psi, 650 lb/hr = 399lph
70 psi, 469 lb/hr = 288lph
15.0 volt test:
40 psi, 735 lb/hr = 451lph
70 psi, 575 lb/hr = 353lph
Looks good to me!! I already got mine just need to install it.
Who wants a never installed Aeromotive 340? (I had ordered one before I knew about the Walbro 400)
I'm going to use 13.2 volt reference at the pump for the amp draw.
The 400 lph pump draws 11.9 amps at 40 psi (idle basically) and 14.2 amps at 70 psi of rail pressure and 15 amps at 80 psi of rail pressure.
The 400 lph pump draws 11.9 amps at 40 psi (idle basically) and 14.2 amps at 70 psi of rail pressure and 15 amps at 80 psi of rail pressure.
I'll post a few data points below for those of you interested:
13.2 volts test
40 psi, 650 lb/hr
70 psi, 469 lb/hr
Amp draw remained the same at both levels.
15.0 volt test:
40 psi, 735 lb/hr
70 psi, 575 lb/hr
13.2 volts test
40 psi, 650 lb/hr
70 psi, 469 lb/hr
Amp draw remained the same at both levels.
15.0 volt test:
40 psi, 735 lb/hr
70 psi, 575 lb/hr
Converting the units:
13.2 volts test
40 psi, 650 lb/hr = 399lph
70 psi, 469 lb/hr = 288lph
15.0 volt test:
40 psi, 735 lb/hr = 451lph
70 psi, 575 lb/hr = 353lph
Looks good to me!! I already got mine just need to install it.
Who wants a never installed Aeromotive 340? (I had ordered one before I knew about the Walbro 400)
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03-06-12, 05:47 PM
#38
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I just had one put in my car last friday. At first i was skeptical of the price but so far everyone ive spoken to that actually has used one (not internet assumptions) has been very happy with it. My mechanic. Had already tested a few and lOved how quiet they are. Boy was he right. This thing is absolutely silent. Combined with a pump rewire, this thing rocks!
03-07-12, 01:17 PM
#39
here' my install, I also bought a new, bigger sock to go with it.
I also checked my connections since I was running a Walbro 255 hp for the last 30k miles and they look perfect. I was concerned because of some burned connectors pics I saw from someone running a walbro 255.
I also checked my connections since I was running a Walbro 255 hp for the last 30k miles and they look perfect. I was concerned because of some burned connectors pics I saw from someone running a walbro 255.
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03-28-12, 01:58 AM
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04-09-12, 03:25 PM
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that should be a good reliability test
04-11-12, 09:33 AM
#47
If you keep the stock fuel pump assembly hanger you don't really need the hose. I didn't use it for the Walbro255 or the 400, check the photos posted above. The Stealth is very similar to the Walbro255 in shape and size so it should not be a problem.
Yes, I replaced the 255 with the 400. I'm not extremely happy with their harness as I would have preferred it to plug directly to the pump like in the 255 but it works.
04-11-12, 09:30 PM
#48
I am affraid that it will he a few years before we see the actual trend analysis of this pump. Even poorly designed products can last awhile. To be proven reliable, these performance pumps should have no problem going for 10+ years.
04-14-12, 06:39 PM
#49
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nice - fyi, this is a popular fuel pump in the evo crowd, as was the old 255. like someone mentioned before, it is a turbine design so it is silent, unlike the 255 "whinebro" - i'm using the deatscheworks 300lph in my evo but it's good to hear the walbro 400 is working well in rx7s. evos haven't experienced any reliability issues with this pump as far as i know, and i'm pretty active on evom, a failure would probably be fairly highly publicized
04-14-12, 10:44 PM
#50
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my mechanic said the only failed walboros he has seen were chinese imitation copies that people buy on ebay, then they blame it on genuine parts because they dont even know they got a knockoff. he maintains/tunes a lot of private cars race cars that spend a lot of time at sebring and he hasnt had issues with any real walboros.