This is topic Wallbro fuel pump problem ? in forum Tech Talk at Northern California Ford Owners  .


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Posted by Stan G (Member # 6226) on :
 
I installed a wallbro 255 lph external fuel pump last week .

It ran fine all week on short trips and one blast run on the freeway up to about 80 in 3rd gear .

This AM, i was driving around 70 mph (26-2700 rpm)and the car started missing/stumbling from low fuel , and in about 1-2 miles died . Full gas tank.

Elapsed driving time ~ 25 minutes.

On the side of the freeway, I jumpered the fuel pump directly to the batt and the car started and ran for another 25 minutes then died again.

I futzed around for about 10 minutes, checking the connections , staring at the motor
then tried starting again.

Again it started and I drove the remaining way home.

My thoughts are the fuel pump is overheating and cutting out .

The fuel filter seems to flowing fine based on the freeway blast last week.

Has any else heard of this happening ?

[ May 05, 2007, 11:24 PM: Message edited by: Stan G ]
 
Posted by JohnB (Member # 969) on :
 
Actually sounds like your fuel pump is pulling too many amps and is tripping the fuel pump relay. My Cobra used to do this if I drove the car more than 45 mins straight.
 
Posted by Stan G (Member # 6226) on :
 
Thanks, good thought , but for the return trip, when it went out the 2nd time, i had it wired directly to the battery.
I checked the filter today and it was fine.

I called the seller yesterday and explained the problem, I was told Walbro doesn't warranty these pumps.
I was told there is a high failure rate due to mis-wiring and clogging , and that's why the non-warranty situation.
I politely mentioned warranty of purpose .
For some reason, after seeing my pump was an external, he seemed to soften his stance and told me he would call Walbro on Monay and get back to me.
 
Posted by cummins (Member # 5931) on :
 
I use walbros a lot. The externals like to be mounted BELOW the tank. This way it works like a siphon if the pick up is on top or gravity fed if pick up is on bottom. Its less stress on the pump this way. Also mounting them as close to the tank as possible helps because pumps like to push not pull.

If you overheat the pump it will have your symptoms (cutting out). Overheating Walbros is a common problem and once you do they are toast.
 




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