Stupid #$#$^%#$%@ Walbro Fuel Pumps

G

gixxer750

2jzget comingsoon!
Mar 30, 2005
2,333
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Mississippi
I really just don't understand. I put walbro number 5 in yesterday, and it failed me today. This has all been within 3 weeks. I've checked voltage going to the fuel pump, and cleaned the tank. I got the rust out the tank by throwing in a bunch of bolts and two gallons of muratic acid. I let it soak for several hours as well as shook it around multiple times. I then washed it out with water for about an hour. I rinsed with gas 10-15 times after that. The tank is now rust free other than the occasional spec here and there.


I've changed the fuel filter three times. The strainers on these pumps are not coming out dirty. I have 10 gauge wire running from battery to pump with the stock wiring triggering a relay to it.


Here is how it is failing. The car runs fine for a while, 16 psi running 11.5 a/f ratios. When the pump starts failing I start seeing around 12.5 afrs. Then it gets leaner and leaner until the car goes 17-1 afr off boost @ 10 inches of vac going up a hill.



I just don't get it. What am I doing wrong? The entire time the pump keeps getting louder and louder.
 
suprahero

suprahero

naughty by nature
Staff member
Aug 26, 2005
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Roll Tide
I've only bought one and it works perfectly, so I doubt that you've had five in a row go bad. I'd say it was something other than the pump itself causing your problems...................Good luck.
 
Adjuster

Adjuster

Supramania Contributor
Apr 8, 2005
1,166
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Meridian, Idaho, United States
www.adjusteridaho.com
Yep, that is just not possible.
Pump failure is pretty remote, and milions of them are made each year, and run for decades in gas tanks around the world.

I would check the following.
Your voltage regulator.
Are you hard wired to the pump, or are you using the stock resistor that varies voltage?

Try another supplier of pumps. (Possible your supplier got a bad batch? Not likely, but possible.)
 
M

malloynx

Member
Mar 30, 2005
877
1
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44
NC
you have an electrical problem. you need to go through your fuel pump ckt and find the problem.

what is the available voltage to the pump? what type of relay are you using and how is it wired. i would suggest going back to the stock setup(wiring) and go from there.

i've been running a single walbro for 2yes now with no problems
 
NashMan

NashMan

WTF did he just wright ?
Aug 5, 2005
4,940
17
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Victoria BC
well there is one thing that can burn out a pump and ketp killing them in matter of dasy 3 of them

one of the feed lines was kinked just eghouhg to flow but to much back persure for the pump so it just keep killing them

fixed line cleaned out all the line's return and feed bango back to norm still driven around to this day


hope this helps
 
G

gixxer750

2jzget comingsoon!
Mar 30, 2005
2,333
0
0
Mississippi
I've got 13.75 volts with the car running at the pump. I have 10 gauge wire running the pump with the stock wire triggering the relay to it. The resistor is bypassed.

I don't get it?
 
suprahero

suprahero

naughty by nature
Staff member
Aug 26, 2005
14,971
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Roll Tide
CK is a very knowledgeable man, but just this one time, let's not take his advice...............:biglaugh:

I'm sure you will figure it out if you keep working on it. Good luck.
 
loki2043

loki2043

New Member
Jan 23, 2006
645
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Portland, OR
maybe your drawing too many amps... and/or arcing/burnt wires causing bad amperage yet still maintaining 12v's

grab an amp meter and check it out... just a thought
 
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