Bad stumble

graham1524

graham1524

Well-known member
Re: Bad stumble

DaveP said:
That is right in the time-frame where Walbro had a quality problem. I assume it's a Walbro. The following is from APE's home page. Scroll down>

October 2008

Walbro engineering has discovered the problem with the F20000169 fuel pumps. They are getting the parts to fix the problem. The warehouse should have the pumps by the middle of November. Then, they'll have to ship them to the distributors. We should get more of those pumps by the end of November.

All F20000169 pumps that are returned will be tested. In the past, Walbro has had over 98 percent of returned pumps run on the test bench as OKAY. Not all pumps will have the problem. Any pumps that are tested to be OKAY will be returned to you. This is NOT an across-the-board recall as far as I know.

Walbro engineering is trying to identify a timeframe when the problem parts got into production pumps. As far as they can tell, any pump manufactured before the 2nd quarter 2008 should be okay. If your manufacture date is before that, they currently don't have a clear reason to swap it out.

September 2008

We have been hearing of a greater than normal number of pump failures in the F20000169 pumps. They aren't all failing. We normally hear of 1 in every 1000 or so pumps with an issue; we're now seeing 1 in every 100 or so F20000169 pumps with a problem.

Since the GSS340, GSS341, GSS342, and F0000169 pumps all have the same internals, Walbro has been focusing its research on the white, plastic inlet piece on the bottom of the pump.

So... until this problem is resolved, APE will not be selling the F20000169 fuel pumps.
Click to expand...

Ok, so i should take it back out and check for one of those serial numbers and send it to Walbro for testing? and hope that it has failed.
 
SloGN

SloGN

9Sec Alky V6
Re: Bad stumble

DaveP said:
That is right in the time-frame where Walbro had a quality problem. I assume it's a Walbro. The following is from APE's home page. Scroll down>

October 2008

Walbro engineering has discovered the problem with the F20000169 fuel pumps. They are getting the parts to fix the problem. The warehouse should have the pumps by the middle of November. Then, they'll have to ship them to the distributors. We should get more of those pumps by the end of November.

All F20000169 pumps that are returned will be tested. In the past, Walbro has had over 98 percent of returned pumps run on the test bench as OKAY. Not all pumps will have the problem. Any pumps that are tested to be OKAY will be returned to you. This is NOT an across-the-board recall as far as I know.

Walbro engineering is trying to identify a timeframe when the problem parts got into production pumps. As far as they can tell, any pump manufactured before the 2nd quarter 2008 should be okay. If your manufacture date is before that, they currently don't have a clear reason to swap it out.

September 2008

We have been hearing of a greater than normal number of pump failures in the F20000169 pumps. They aren't all failing. We normally hear of 1 in every 1000 or so pumps with an issue; we're now seeing 1 in every 100 or so F20000169 pumps with a problem.

Since the GSS340, GSS341, GSS342, and F0000169 pumps all have the same internals, Walbro has been focusing its research on the white, plastic inlet piece on the bottom of the pump.

So... until this problem is resolved, APE will not be selling the F20000169 fuel pumps.
Click to expand...



yeah i got hit with a crappy pump in my GN last yr and it costed me a set of headgaskets due it it losing fuel pressure @ the race track.


Graham if ya need a hand i'll be in burlington tommorow call me sometime. i'll have the scanner and try and take a look at some other things aswell
 
SloGN

SloGN

9Sec Alky V6
Re: Bad stumble

UPDATE.........

I went by and have graham a hand today on his sy. The fuel pump was running strong but was not making but 18-20psi of fuel pressure and lost that pressure as soon as the pump quit running.

So i dianosed the problem as either being a bad pump or a split in the hose inside the tank.

Well he took the bed off the truck and opened it up and found a bad hose so problem solved.
 
graham1524

graham1524

Well-known member
Re: Bad stumble

SloGN said:
UPDATE.........

I went by and have graham a hand today on his sy. The fuel pump was running strong but was not making but 18-20psi of fuel pressure and lost that pressure as soon as the pump quit running.

So i dianosed the problem as either being a bad pump or a split in the hose inside the tank.

Well he took the bed off the truck and opened it up and found a bad hose so problem solved.
Click to expand...

the hose that came with the kit had almost disintegrated in the tank and Pat helped diagnose some other stuff on it. Thanks. now it runs fine again.
 
turbodig

turbodig

Active member
Re: Bad stumble

graham1524 said:
This thing keeps going went out today to start it up and once again hard to start and stumble like crazy even after it ran perfect the other day. So is there anyway it could be killing the map sensor or i just havent found the real problem yet?
Click to expand...

Haven't found the real problem.

Sounds a lot like a dying fuel pump to me.
 
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