Walbro 255 Install/Car Shut Off

[Steve Wood]

I am lost on this one....if you hear the pump running, then I would think it would be pumping.....

So, if you remove the pump from the tank and set it in a bucket with some gas in it, it should not pump either with a ground and a positive connected to the pump....even if it sounds like it is pumping

If you try this test, be sure to connect the feeds to the fuel pump, set it in the bucket and make the power connection to the battery afterward in order to avoid a spark at the pump connection.

If it then pumps, we know it is not the pump.  If not pumping or running, shake the pump.

before you do this, tho....connect the stock wiring, and under the hood, jump 12 volts to the gray test connector straight from the battery or back of the alternator...a short jump makes it easy from the battery stud on the alternator to the test connector.

This powers the pump and bypasses the ecm so the pump runs full time instead of two seconds-key does not need to be on

[Joel Russo]

I already tried the stock wiring and the jump from the test lead.  The pump sounds like it runs, but no fuel is pumped.
 
Now I have 10 gallons of fuel in the tank, and no way to pump it out before I drop the tank again and try to figure this out again.
Hey SuperSix... I'm getting tired of this Shit.

[278CIKILLER]

Are you sure the fuse under the dash is still ok.

[Steve Wood]

65 pounds of gas...need an assistant

I understand getting tired of it

[Joel Russo]

Are you sure the fuse under the dash is still ok.

I checked every fuse in the block multiple times, and they are all good.


Just picked up one of those hand pump thingies from the auto parts store, gonna try to get some of this fuel out before I drop it again.  Wife's getting tired of me coming in smelling of gas.

[Steve Wood]

wired direct as you had it eliminates any fuses or relays...almos t sounds like the polarity is reversed...pum p running backward and nothing coming out....but, unless the first one was bad and this one is reversed on the polarity markings, that ain't it

[Joel Russo]

wired direct as you had it eliminates any fuses or relays...almos t sounds like the polarity is reversed...pum p running backward and nothing coming out....but, unless the first one was bad and this one is reversed on the polarity markings, that ain't it

I thought about the reverse polarity as well, but there's only one way to plug the pump in with the supplied wire. 


I sucked out most of the fuel and dropped the tank enough to disconnect the feed, vent, and return lines.  Between smelling the fumes, and being late at night, I'm starting to argue with myself...and losing the arguments.  LOL..  I'll pull the guts out in the morning and take a look.

[Steve Wood]

Some times you have to make yourself laugh in order to keep from killing the car or the first person that walks by and asks why you keep working on it

[daveismissing]

Manufacturing debris blocking the pump intake?

What kind of pre-testing can we do to have confidence in a pump?
Measure flow thru open pipe?
Add a restriction and confirm we still have decent flow?

[Steve Wood]

yeah, the old gallon per minute is not a bad test open flow and we cold deadhead it momentarily to see if it jumps to 70 psi or whatever the bypass is set to

Have to remember that running one that is not submerged will burn it up very quickly so other than a quick touch to see if it is going to start is it.

I often wonder how many pumps are ruined from someone plugging them in on a bench or simply from running low on fuel and sucking air

[Joel Russo]

 

wired direct as you had it eliminates any fuses or relays...almos t sounds like the polarity is reversed...pum p running backward and nothing coming out....but, unless the first one was bad and this one is reversed on the polarity markings, that ain't it

 
 
I pulled the guts out of the tank and took a look  at the wiring.  It all looked just like it did when I put it in the tank a few days ago...
Sooo.... I took it to the bench and filled a small container with gas and put a short hose on the hard feed line coming off the sending unit.  I kept the new Racetronix supplied wire plugged into the bulkhead.  Had a friend hold the works while I gave the hot and ground terminals of that plug a 12 volt zap.  pump ran, but no gas out of the feed line... WTF.. I said.. scratched my head and figured I would reverse polarity.  Why not... Nuthin' else seemed to work thus far.   
Reversed the wires and hit the ground with the hot and the hot with the ground.. pumped like a good pump should and had fuel gushing out of the feed line..  Go figure.  As you know, there's only one way to plug these things in as the connectors are stupidproof.  So the only conclusion I can come to is that the wires are on  the wrong terminals on the plug.
A friend of mine who races NHRA Super Stock at the national level is headed over in a few hours to help me figure out where to go from here.  He's a bit more savy on solving wiring issues than I am.
 

[Steve Wood]

LOL

I thought those things only happened to me.  Did this pump come from Eric also?

there are a lot of counterfeit walbros on the market.

If it worked when you reversed the connections, then that is definitely the problem.  Don't think it is possible to be elsewhere than the pump but if this was a new wiring harness, meter it to be sure the wires are not crossed in the bulkhead connector or in the outside the tank harness....str ange things happen with new stuff

Unless I find something quick, it looks like I may be dropping the tank on one of my cars.  It was cutting out and then running okay...today, it failed in front of my shop after I returned from a test drive...Thank goodness it failed there and not on the highway..and thank good it failed!  Lot easier to figure out the problem when it stays failed!

[Joel Russo]

LOL

I thought those things only happened to me.  Did this pump come from Eric also?

there are a lot of counterfeit walbros on the market.

If it worked when you reversed the connections, then that is definitely the problem.  Don't think it is possible to be elsewhere than the pump but if this was a new wiring harness, meter it to be sure the wires are not crossed in the bulkhead connector or in the outside the tank harness....str ange things happen with new stuff

Unless I find something quick, it looks like I may be dropping the tank on one of my cars.  It was cutting out and then running okay...today, it failed in front of my shop after I returned from a test drive...Thank goodness it failed there and not on the highway..and thank good it failed!  Lot easier to figure out the problem when it stays failed!

This pump also came from Eric, but it is in the Racetronix packaged box...  The "in the tank wiring harness" also came from him and was packaged from Racetronix as well.
 
Going to check it thoroughly with the volt meter in about an hour.
 
Don't know how much fuel you have in your tank, but i bought a $14.00 hand pump that worked like a charm in getting 10 gallons out of mine last night.
 
When this thing first failed it was on my driveway and I was bitching I had to push it in the garage...
 
 

[Steve Wood]

Mine was about empty so I thought maybe it was just out of gas altho I have put a 150 miles on it since I felt the first "jerks"

Just jumped it and found the pump was running so I added a couple of gallons of gas and it acted like it wanted to run...so I am guessing that $1 a foot in tank hose is leaking but I guess I have to open it up to find out   Wish I had not added another couple of gallons to slosh around but sometimes stuff happens

I am running a Denso from Racetronix plus his harness which failed due to a bad crimp on the connector the first time I put it in....I blobbed some solder on it and have been living in fear that it would crack from vibration....t hink I will order another one before I drop the tank so I can eliminate that concern

Take your meter and put it on ohms to verify that who ever made the harness did not mix up the connections in the plugs

[Joel Russo]

I'm not impressed with the connections on the wires from Racetronix... The hot and ground ones that go from the pump to the bulkhead fitting have pulled from the small metal connectors.  I will be soldering those before I re-install.  In fact, I'll solder all the others as a pre-caution.
When I researched the fuel pump deal, I went with what the masses were running.  Figured it would be just a plug and play like advertised.
You know, I don't mind paying good money for quality stuff.  This whole Walbro/Racetronix situation has left a bad taste in my mouth.  I sent them an e-mail asking to speak to a live body as I was having issues with their product.  Their response was to go to the website... never saw a website with a pulse... 
I run a small business, and I pride myself in customer service.  If it's not right, then I will make it right.  How you treat people is more important than the profit you make off the sale.  oh well better start soldering...