Alright guys this problem of mine needs second third fourth and fifth opinions.When I first did my ls1 swap years ago I was using stock tpi intank pumps and went through 1 every 6-8months untill I got left stranded one late night 2hrs away from home and finally put a walhbro 255 intank which has lasted me the past year and a half untill tonight.

I went out earlier and came home for about 2hrs.I was about to head out for the local weds night car meet and had no fuel pump..no prime at all.My fuel pump relay is a regular 30amp bosch relay which I have fused directly from the battery and the relay resides near my fuse panel for easy access.The relay and all wiring for the fuel pump are working properly with full 12v and ground at the back going into the tank connector according to my multimeter.So I know the pump is dead somehow.Could I have burned out the pump?Prior to this within the past week or so i noticed the smell of fuel everytime I had started the car but never found any fuel leaks. Im using the corvette filter/regulator ,the vent line is just cut short past the tank open to atmosphere and the evap/charcoal canister line is capped and Im not using a vented gas cap.Does any of this put added stress on my intank pumps that i should revise on my setup before I drop this all down..change a simple pump and only have it go on me again maybe a year from now?

Looking for any insight.

 

I've said it before, reluctantly even though people like to not accept sound advice, i'll say it again.

Buy an OEM Denso 95 Supra TT fuel pump.

Enjoy never having to play this game again.

 

Hmm cant say Ive heard about that when i first did my swap and was researching what were good units to use.care to elaborate on why to use that pump over and aftermarket unit?

 

They're dead silent, outflow a walbro 255, and last for a typical 15 yrs or so.

 

Also, is your exhaust really close to your fuel lines in any area ? Overheating the fuel shortens a fuel pumps life, running around all the time with an empty tank is also a fuel pump killer.

 

Lol and probably half the price also.

Dont know if this has any bearing on the issue.As Im checking the relay wiring pins 30 and 87 are wired opposite of eachother.30 should be fused 12 battery source and 87 going to the pump.It sits right now as 30 going to the pump and 87 is fused 12v battery source.Im assuming this may have caused the pump to run hot drawing..or trying to draw current from the relay.

Other than that..I cant forsee any other things that stand out to kill my fuel pumps so often.I will look into the supra pumps though,thanks for that tip.All this time i was praising my walbro since it lasted more than a year lol.

 

I dont run the car lower than 1/4 tank and the fuel line seems to be pretty clear of exhaust heat front to back.it may get some heat near the bend coming up around the firewall but I dont think its bring it to a boil situation and my motor doesnt run very hot but i will check just for peace of mind again.

 

Which way the connections are hooked up to the relay will not matter, its not directional.


The only time that will matter is in a setup with something like 4th gen factory wiring for the fans where they run high/low series/parallel, or being able to use the factory test wire that typically comes off the relay connector.

 

I thought the same but some ppl seem to think it would make a difference.I doubt it also.I just find it strange how it quit out of nowhere so easily when it was running 2hrs prior.Ah well..gotta find a pump in the morning and get her up and running again.

 

I have been running a walbro 255 in mine for almost 2 years with no issues, my corvette regulator is in the factory filter location. Where is your regulator? Could putting it under the hood make for higher fuel temps because of the regulator returning heated fuel from under the hood back to the tank? My EVAP line is capped off and the factory vent is still in place. I also try really hard not to drive the car with under a 1/4 tank of gas.

 

If they get warm they die quick but you covered the fact that you always keep fuel in the tank so perhaps theres a lead not up to snuff somewheres. Its not complex wiring i think id start with a fresh circuit, brand new relay and all. Hard to know what caused it but this will remove any unknowns with your wiring and its cheap too.

 

The regulator is in the factory location and only line going to the front is the feed line.The wiring to the pump if new and the relay when I did the swap on this car earlier this year.But thats just the wires going to the original connector behind the back seats.So maybe need to rewire the connectors at the tank also.For now..I need to pull a pump out today in my driveway...then find a pump that wont cost me an arm and leg.

 

don't cheap out on the pump....you get what you pay for.

where have you been buying the pumps? there are a lot of knockoffs out there that claim to be a legit walbro 255. when it comes to something like this, i'm happy to spend a few more bucks to avoid dropping the tank.

z28ricer...is the supra tt pump a direct fit, or a make it fit? what psi and flow is it rated at?

 

It was a real walbro.bought it at a reputable speed shop.

 

Up and running again.I went to the local hardware store and got some small things to make a fuel access door like I had in my old car.Pulled the carpet back and dove in making my cuts.Lucky for me on this swap..everything was reused from my old car including the tank and lines which I made for easy pump removal.Once i got the pump assembly out i spotted the culprit on the inside wiring connector gummed up all around and inside the pins.So I figured while im in here to solder the wires directly to the pins coming into the tank and ditch the 1987 connector.Test the pump with a jumper wire and all is well again...untill I smelt fuel from under the hood.WTF..so i put my trunk back together,seal my trap door etc and then go hunting for a fuel leak which i found at the a/n fitting...a quick snug,30x priming the system and checking leaks without a drop so i start it up and let it run for 10 mins.Now i can move on ..jeeez what a day

 

glad you got it figured out. the first initial prime on my car after the swap had fuel spraying out of a fitting.

 

Z28ricer,
Do you have a part number for this? Also, is it an in-tank pump? Thanks!

 

They are a pretty easy and quick find, either had through a parts store who sells the oem denso part, or numerous performance parts places online.


IIRC they flow a bit more than the walbro 255, something like 20-30lph more.

The flow isn't the real gain, its the fact that they typically last much longer, and are silent.

 

If I have to replace the walbro I may try the denso supra pump but when i priced it out around here I was getting quotes at nearly $250-300 and the walbro was $170.I got my walbro for cost through a friend but no longer have a hookup at that speed shop . I dont find it to be loud like others say they are but i think it depends on which lph pump you get..I can hear my pump prime and to me its a relieving sound to know it works lol...having a dead silent pump would have me nervous..its also who i knew my pump stopped working was that I didnt hear the usual pump prime.I got nothing against the walbro as it stands serving my car still.

 

If your car eats another pump quickly its not the pump its something else. Too many pump failures in succession for it to be another faulty pump, the problem will be elsewhere.

*fingers crossed for ya that its solved*

 

Voltage. You've gotta keep good voltage to the pump or they'll die as well.

Since my battery is in the rear, I just ran the 12v PCM control to a relay in the spare tire well. From there the fuel pump is powered with relatively short wires from the batt.

 

I agree about liking to hear the priming, but after an hour of driving, the whine is far too loud. I found a box in the back from a cheap Airtex replacement pump, and I expect asking it to push more pressure for an LSx would kill it immediately.
The Denso for the Supra turbo is $180 with the strainer, Denso 9500155, or $2 more without the strainer (?) Denso 950014. So I looked up the pump for a '99 Z28 and regretted it, then moved on to a '91 Z28 5.7; the Airtex for that is $40 without strainer, the Denso is $79 without strainer, Denso 9515014, and I think I'll start there.

 

I can't help out much with the pumps going bad, but if you're looking for an even higher flowing in-tank pump. I would check out the Aeromotive High Flow 340lph. It costs less than the OEM Supra pump and is a little more than the Walbro. I have one in a box waiting for the rest of my build, so I can not attest to its quality, performance, or quietness because it's not installed.

 

Sexy-looking part for installing where nobody can ever see it.