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The walboro is going on regardless, so it's not of major concern to me. However here's a kicker for all you guys. She started right up and i drove her 15 minutes from my parking lot to my house no issues. Turned her off and tested to see if it was a fluke and she started right up again. So what now? Fuel pumps don't come back from the dead...atleast i wouldn't think so. I got a new gremlin to hunt down and kill. O and btw i'm starting to wonder if the problems i've been having arent' weather related. Every time she starts acting funky its during warm weather 65* and up...and we've been getting random runs of hot and cold every other day or 2 days for the last month and pretty much how sparatic the issues have been.

Fuel pump relay could be acting up. Try swapping it with your other car.

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It is part of the "Stage 0" procedure

anyone have an answer to my question regarding the 255lph vs OEM fuel consumption?

Running a pump with significantly higher flow rate than stock (such as the big Walbro in place of the stock unit...) will cause an increase in fuel pressure due to limited regulator and fuel return system capacity. The ecu can correct for this using oxygen sensor feedback when running closed loop. Open loop operation (idle, heavy accel, cold-start, warmup) will likely end up running richer than normal, as the ecu is determining injector pulse widths based on lookup tables from the factory which assumes OEM fuel pressure. Without testing before/after fuel pressure it's tough to predict whether or not this effect will be significant.

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I know it wasn't a FWD, but my 95 960 had 172,000mi on the original fuel pump, before the car was totaled. To note though I learned with my bowties, not to let the gas get too low. Usually refueling around 1/4 tank.

I just bought a 850R with 102,000mi.

I haven't actually seen a fuel pump on a stage 0 list, but I'm planning to replace it soon, hopefully before I have to.

The relays and filters are in a box waiting their turn. I actually should have the extra fuel pump relay in my glove box.

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What I found about the fuel pump relay marked 103 is that it is proned to failure.

As inspired by a writeup over at matthewsvolvosite.com, I THINK I figured out the exact cause of the fuel pump relay failure.

DSCN1391.jpg

In this picture you see these two capacitors. They are the round cylindrical items sticking up from the circuit board. Now in the write up that I read, they cited these two as the suspects for the failure, but no reason why.

So when my cousin's S70 started stalling, we looked at several possibilities we first thought fuel pump. Its been 130K, so its probably toast by now. But I decided to take the relay out of my 850, which in fact was different (one extra pin and yellow colored relay box, plus different part number) and put it in his car. His S70 no longer stalled and the problem went away. So I took his relay, opened it up and proceded to remove the capacitors.

I ordered high grade capacitors to be installed in its place. I especially had trouble finding the right one for the silver one that is shown, because its size was unique and not easy to find. Which lead me to think, why was this capacitor so unique? It doesn't look like any normal capacitors like the one next to it... something's up.

I suspected that this was some sort of high density capacitor, but this is no longer a problem since time has past since this was constructed and capacitor technology had advanced (smaller and even better values). Once I removed them and put the new parts in, I decided to crack open the capacitor.

Turned out the silver one was the culprit all along. The internals of the capacitor was dried up, when it should be soaking wet with electrolytic chemicals, the paper inside it was all dry and falling apart. This capacitor basically crapped out over time. The other one I don't even need to look at, since this was clearly why it failed.

My cousin's S70 now runs fine and he can be rest assured that the repaired and beefed up relay won't fail for a long long time to come.

If anyone wants I still have a extra set of high grade (Nichicon PW/HE series) capacitors and can repair or beef up a relay... PM Me.

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I had the same thing happen to me with my fuel pump. In the summer i noticed if i went over a bump occasionally, or slow down quickly by car would die from lack of fuel. That ended up being the relay. I was good untill the 23rd of Dec. I had driven the car that day about 100 miles or so. That night I had the car warming up for 20 minutes with my remote starter which had killed the engine because it sat there to long (safety). I went to restart it and it just kept cranking, and cranking. I ended up getting a lift home and coming back 30 minutes later with some tools. Still nothing. I checked the fuses, knocked the general area of the fuel pump. Nothing. Sat there another 2 minutes tried again. Vrmmm. Started. That lasted 3 days. Then again. Same thing in the driveway. Waited a little bit and it started. 3 days later at the post office... same thing. Finally it started and I drove straight to the dealer. It's been one month now and haven't had the problem anymore. I have around 225,000 miles on mine. So basicly it only happened randomly. Once it was running I had no problems. I'm sure you need the same.

Regards

Sandro

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What I found about the fuel pump relay marked 103 is that it is proned to failure.

As inspired by a writeup over at matthewsvolvosite.com, I THINK I figured out the exact cause of the fuel pump relay failure.

DSCN1391.jpg

In this picture you see these two capacitors. They are the round cylindrical items sticking up from the circuit board. Now in the write up that I read, they cited these two as the suspects for the failure, but no reason why.

So when my cousin's S70 started stalling, we looked at several possibilities we first thought fuel pump. Its been 130K, so its probably toast by now. But I decided to take the relay out of my 850, which in fact was different (one extra pin and yellow colored relay box, plus different part number) and put it in his car. His S70 no longer stalled and the problem went away. So I took his relay, opened it up and proceded to remove the capacitors.

I ordered high grade capacitors to be installed in its place. I especially had trouble finding the right one for the silver one that is shown, because its size was unique and not easy to find. Which lead me to think, why was this capacitor so unique? It doesn't look like any normal capacitors like the one next to it... something's up.

I suspected that this was some sort of high density capacitor, but this is no longer a problem since time has past since this was constructed and capacitor technology had advanced (smaller and even better values). Once I removed them and put the new parts in, I decided to crack open the capacitor.

Turned out the silver one was the culprit all along. The internals of the capacitor was dried up, when it should be soaking wet with electrolytic chemicals, the paper inside it was all dry and falling apart. This capacitor basically crapped out over time. The other one I don't even need to look at, since this was clearly why it failed.

My cousin's S70 now runs fine and he can be rest assured that the repaired and beefed up relay won't fail for a long long time to come.

If anyone wants I still have a extra set of high grade (Nichicon PW/HE series) capacitors and can repair or beef up a relay... PM Me.

Where is the relay located? Thanks

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I had the same thing happen to me with my fuel pump. In the summer i noticed if i went over a bump occasionally, or slow down quickly by car would die from lack of fuel. That ended up being the relay. I was good untill the 23rd of Dec. I had driven the car that day about 100 miles or so. That night I had the car warming up for 20 minutes with my remote starter which had killed the engine because it sat there to long (safety). I went to restart it and it just kept cranking, and cranking. I ended up getting a lift home and coming back 30 minutes later with some tools. Still nothing. I checked the fuses, knocked the general area of the fuel pump. Nothing. Sat there another 2 minutes tried again. Vrmmm. Started. That lasted 3 days. Then again. Same thing in the driveway. Waited a little bit and it started. 3 days later at the post office... same thing. Finally it started and I drove straight to the dealer. It's been one month now and haven't had the problem anymore. I have around 225,000 miles on mine. So basicly it only happened randomly. Once it was running I had no problems. I'm sure you need the same.

Regards

Sandro

Your story sounds very familiar. I'm going to cannibalize my coral tonight for the walboro.

Kevin your story sounds similar too, i'm going to grab my relay out of the coral and see if that helps. is your cousin still using the 850 relay? i might just go to volvo and buy an 850 relay.

i'm thinking maybe filter too, luckily i replaced the one on the coral no too long before it died so i can cannibalize that too.

i'm just gonna up the ante on the fuel system and replace everything short of injectors, FPR and fuel rail. if that doesn't help then those are next to go.

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I've heard or relay repairing and rebuilding but doesn't seem worth doing, guess that's just me though. I mean when my '94 855T would randomly cut out suddenly, I just replaced mine with the updated version (Red I think), was only around $30 at the dealer.

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Mine died on my 850 on monday night. It was 14 degrees outside, and I was 45 minutes from home. I love how stuff like this happens at the most opportune times! :lol:

But mine has 171xxx on the clock. I'm going to put in a walbro255 lph pump this saturday if an arrangement works out smoothly. I can't wait to sound like a chevy suburban when I turn the ignition on haha.

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Mine died on my 850 on monday night. It was 14 degrees outside, and I was 45 minutes from home. I love how stuff like this happens at the most opportune times! :lol:

But mine has 171xxx on the clock. I'm going to put in a walbro255 lph pump this saturday if an arrangement works out smoothly. I can't wait to sound like a chevy suburban when I turn the ignition on haha.

the 255lph isn't even loud, i've never noticed it turn on...or atleast i hear the antenna more then i do the pump :lol:

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the 255lph isn't even loud, i've never noticed it turn on...or atleast i hear the antenna more then i do the pump :lol:

awwwww meeyyunnn!!!! <_< that suxors. Oh well. Any notice in cold start abilities, or any other change?? Or does the car run the same as before?

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