....reliably feed an lsx motor? i'm having some issues with the little bro's car. i assumed a factory pump would be sufficient for a stock 5.3, but i can't get the pressure above 50lbs without the pump shutting off all on it's own. i even wired a switch in line with direct power for trouble shooting (as in no relay, no ignition swith, no fuse, directly from the battery, to a toggle, to the pump.) and no luck. i'm using an Aeromotive 13301 fuel pressure regulator with the high pressure spring. the factory feed and return lines are being utilized. the car now has a fresh strainer, filter, and gas. i also blew out both the feed and return lines, and made sure the tank vents were working correctly. no luck. any help appreciated!

 

anyone used this edelbrock 3581 pump?

http://www.summitracing.com/parts/EDL-3581/

the price is definitely right...and edelbrock isn't totally terrible quality wise on a car of this caliber.

 

A tpi pump would be short lived with any LS motor. The link you have is the basic walbro 255 unit which would work. All those pumps out there that look like that are made by walbro. Search for the cheapest

 

it seems they're not all created equal though. i can't find any info out on max psi on the walbro units. but this edelbrock is good to 100psi (which we obviously won't need). i just want the thing to fire up and work now. it fires up on starting fluid, so i know other things are functioning correctly. not sure how i looked this detail over.

 

Make sure its specific for your vehicle. The edelbrock pump you would want would be 17933

 

i'm not totally sure why it needs to be vehicle specific. if it fits on the end of the sending unit, has the correct connectors on it, and utilizes a switched 12v power source, application is irrelevant, given that it meets the correct volume and pressure requirements.

 

So are you saying it wont fire up and idle on that pump? If so, you have another problem. That pump will feed the motor enough to fire up and idle.

 

that is what i'm saying. the pump is suspect to begin with. it sat in old fuel for two years without being used. so we're looking at a replacement pump to begin with. i'm just wondering if i can use a factory replacment pump, but after looking at the pressure requirments, if we have to replace the pump, we may as well upgrade.

 

I got mine from here http://treperformance.com/c-62526-fu...ps-walbro.html

 

while there are always other options out there, the walbro 255 seems to be the defacto swap pump for LSx guys and will feed most N/A applications with ease. These swaps have enough bugs and headaches to chase as-is, I wanted to keep it simple where I could for now and the Walbro's a pretty proven part here

 

The pump wont work well but it should run it. Ive had TWO cases now when attempting initial start up where the damn injectors were seized. Took me two days to figure it out the first time. I had tested anything and everything and was pretty sure it was a VATS related issue as I was running the resistor box and had no access to HPtuners at that time. Then miraculously I managed to get it fired at WOT on ONE cylinder only. Then it just dawned on me that perhaps the injectors were not opening even though I had tested the circuits with the blinking light testers and fuel pressure was good and spark was there etc. So I tapped the injectors for about 10 seconds each with the end of an 8" 3/8" extension and tried again and I had it running on about four. It began idling so I just waited until I could feel which exh pipes were cool and tapped those injectors one by one until they started opening and presto she ran great afterwards.

Second time this happened I was onto it right away and it was running beauty **** in five mins.

Hope this helps but regardless that pumps gotta go. Just get a stock LS1 pump they can be found used on the uber cheap over at tech

 

Stock pump for a Sy/Ty is 255 LPH and will support that 5.3 no problem. It's a direct fit as well.

 

In his other thread he said the old TPI pump is only putting out 38 psi.

 

I've been running my 5.3 on a stock tpi pump for over 2 years...

 

Hard to know what pump is in what unless your the original owner. Ive seen walbros in white box no name parts suppliers before. Aftermarket is hit and miss sometimes so you clearly got lucky but theres been more than a few guys on here in the early LS swapping days who all had issues with the stock third gen fuel pumps not supplying enough fuel.

Who knows maybe theres a lot more power on the table for you? Have you tuned it and measured a/f? Just cause it runs well doesnt mean its where it needs to be. Lots of unknowns

 

Get a 4th gen gas tank from the junky yard. Go to racetronix.com and get the whole bucket with pump an sender new for $100. They ship fast and have great quality stuff

 

not interested in doing it that way, the car is setup already setup this way, with adjustable fuel pressure regulator, and all. we'll just get a quailty replacement pump.

 

Cam,
I just got into tuning it. It has been down for a year or so while I reworked complete suspension and brakes. I'm sure there is some more there for me. I was just stating it can run on the stock style pump. I put a tpi pump in when I first built the car. I left it in when I put the 5.3 in. This was done about a year after the tpi was put in. I do notice a slight hesitation when i nail it from a stop tho...

 

You can also get one from a 96-00 vortec pickup truck. They use walbro 190lph pumps at 60psi which is the same as 98-02 Fbodys minus the venturi valve to fill the bucket. Any parts store will have them in stock with a warranty

 

interesting thought jon. i'll check that out when i get back to work today (i work at o'reilly auto parts)

 

I was also weary about purchasing a 255 Walbro when I was fuel pump hunting having heard about the chinese knockoffs. I bought mine from ebay username 'highflowfuel' and they guarantee their pumps not to be cheapos.

Link:http://cgi.ebay.com/ebaymotors/HFP-2...Q5fAccessories

I'm quite happy with mine as its still making me smile.
And an incredible price to boot.

 

a good friend of mine got burnt by Racetronix last month, they sold him a junk Walbro 255 and then refused to warranty it. he went back to the stock 190 LPH pump and threw away the Walbro.. He's out a few hundred bucks but at least his car runs.

 

after looking at the 190lph pumps we offer through work for the 96-00 trucks, and the heavy discount we get on the pump, we'll be going with that one.

 

UPDATE! the vortec pump was purchased and installed yesterday! it works amazingly! i had the regulator really cranked up trying to get the pressure usable with the tpi pump. as soon as we had power, it pegged the gauge. pulled the pressure back down to 60psi and we were ready to go. hit the ignition and it fired right up. now to send the pcm back to the tuner i used with the 6.0 in my car to have them put MY vin number back in the pcm (why they changed it, i'll never know). once we get that, i'll load a stock 5.3 tune and see how well it runs. the 6.0 tune that i had for my car barely runs this little 5.3. (something about a tune for 40# injectors with 11.5:1 compression, and a 232/240 cam trying to run this stock 5.3 with 26# injectors just not jiving too much, lol)

thanks jon for the suggestion!