Just installed Walbro 255 pump. Now having problems. HELP please.
Thread Starter
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Joined: Jul 2002
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From: San Antonio Texas
Just installed Walbro 255 pump. Now having problems. HELP please. Installed a walbro pump and now having issues:
1) car doesnt want to start. it seems like a problem with fuel delivery. The car will only start after 4 attempts of turning the key towards ignition. When turning the key to "on", you can hear the fuel pump working.
2) When the car finally makes it to the highway, I am restricted from accelerating with half throttle position (and the service engine light comes on). Also when I actually get on it, the car falls on its face and jerks as it moves (very similar as to how a car would act if it was running out of gas).
3) MOST IMPORTANT ISSUE:
Three people I know said "your stock fuel regulator is probably having trouble handling the high fuel pressure from the walbro pump". Did I miss something? Do I need to upgrade any fuel regulators when installing a fuel pump? anything else besides regulators?
What is even more confusing is that a mechanic I know at the pontiac service department told me ls1s dont have fuel regulators but instead have purge regulators. The first thing I decided to do is replace the fuel filter and go on from there.
In the meantime, do I have a "bottle kneck" in my fuel system? Im worried because I have nitrous on the car (see mods in sig).
1) car doesnt want to start. it seems like a problem with fuel delivery. The car will only start after 4 attempts of turning the key towards ignition. When turning the key to "on", you can hear the fuel pump working.
2) When the car finally makes it to the highway, I am restricted from accelerating with half throttle position (and the service engine light comes on). Also when I actually get on it, the car falls on its face and jerks as it moves (very similar as to how a car would act if it was running out of gas).
3) MOST IMPORTANT ISSUE:
Three people I know said "your stock fuel regulator is probably having trouble handling the high fuel pressure from the walbro pump". Did I miss something? Do I need to upgrade any fuel regulators when installing a fuel pump? anything else besides regulators?
What is even more confusing is that a mechanic I know at the pontiac service department told me ls1s dont have fuel regulators but instead have purge regulators. The first thing I decided to do is replace the fuel filter and go on from there.
In the meantime, do I have a "bottle kneck" in my fuel system? Im worried because I have nitrous on the car (see mods in sig).
Last edited by 2002_TAWS6; Apr 11, 2005 at 09:39 PM.
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From: Omaha, NE
You should not use a fuel pump designed for a return type fuel system in a returnless system such as your '02' . If this is the case here, your fuel pressure is way too high causing you to run too rich. Also, the pumps days are numbered.
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From: Omaha, NE
Originally Posted by oange ss
if it's a Walbro then it's not a return style and it's a replacement intank pump....you may have kinked the rubber pump hose when you installed it or maybe the hose is leaking
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Originally Posted by dynocar
You should not use a fuel pump designed for a return type fuel system in a returnless system such as your '02' . If this is the case here, your fuel pressure is way too high causing you to run too rich. Also, the pumps days are numbered.
all ls1 f-cars are return systems, but only have 1 line to the rails, there is a T fitting at the back of the car next to the fuel filter, that goes back to the tank. The regulator is mounted in the tank. All fuel upgrades can be treated the same as any other car, with a return line. Just be careful about overpowering the regulator with a high pressure/volume pump.
Ryan
Thread Starter
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Joined: Jul 2002
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From: San Antonio Texas
everything in my fuel system (regulator, fuel lines..etc) is stock besides the fuel pump.
The pump I now have is a walbro in tank pump.
Am I overpowering the stock regulators with this setup?
The pump I now have is a walbro in tank pump.
Am I overpowering the stock regulators with this setup?
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Joined: Sep 2004
Posts: 564
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From: Omaha, NE
Originally Posted by slow
where is the returnless style fuel system in a 2002 Z?
all ls1 f-cars are return systems, but only have 1 line to the rails, there is a T fitting at the back of the car next to the fuel filter, that goes back to the tank. The regulator is mounted in the tank. All fuel upgrades can be treated the same as any other car, with a return line. Just be careful about overpowering the regulator with a high pressure/volume pump.
Ryan
all ls1 f-cars are return systems, but only have 1 line to the rails, there is a T fitting at the back of the car next to the fuel filter, that goes back to the tank. The regulator is mounted in the tank. All fuel upgrades can be treated the same as any other car, with a return line. Just be careful about overpowering the regulator with a high pressure/volume pump.
Ryan
Originally Posted by 2002_TAWS6
Am I overpowering the stock regulators with this setup?
Make sure the hose is not crimped and the hose is not leaking from the outlet of the pump to the outlet of the tank. Check the fuel pressure with a gauge.
Ryan
Thread Starter
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Joined: Jul 2002
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From: San Antonio Texas
fuel pressure gauge read 20 at idle (and startup). Pressure fell down to extremely low pressures immediately after going almost WOT (manually flipping the throttle plate open). Service engine soon light now lit again.
Having trouble finding the same mechanic that installed the walbro pump to check the fuel pump hoses ... etc.
Another mechanic offered to fix my problem for $100 but required to cut a rectangular piece through the body until he has access to fix the problem (and ofcourse repair back the rectangular piece). He said he's done it before and comes like that factory on certain cars. He said thats the only way to getting access to the fuel pump without needing a lift. Good idea or bad idea, it doesnt matter when it costs $100. He works at the pontiac service department and said they would quote me between $300-400.
It sucks *** when you have no mechanical skills.
My worst case scenario could be needing the other mechanic to fix it by cutting the piece (a.k.a. the ghetto way)
.. but can someone tell me what sort of problems i'd run into if i did that?
Having trouble finding the same mechanic that installed the walbro pump to check the fuel pump hoses ... etc.
Another mechanic offered to fix my problem for $100 but required to cut a rectangular piece through the body until he has access to fix the problem (and ofcourse repair back the rectangular piece). He said he's done it before and comes like that factory on certain cars. He said thats the only way to getting access to the fuel pump without needing a lift. Good idea or bad idea, it doesnt matter when it costs $100. He works at the pontiac service department and said they would quote me between $300-400.
It sucks *** when you have no mechanical skills.
My worst case scenario could be needing the other mechanic to fix it by cutting the piece (a.k.a. the ghetto way)
.. but can someone tell me what sort of problems i'd run into if i did that? Last edited by 2002_TAWS6; Apr 13, 2005 at 11:33 PM.
i've been reading a lot on the fuel pump installs lately and noticed a divide between people who cut access doors and those who don't want to cut their car.....my car is a '98 so it's a harder in the first place, but the next time i have to change the pump i'm freaking cutting an access hole......the 98s are more of a pain because of the steel tank/filler tube, not too mention it was my first time doing anything like it, but i'm havng a heck of a time just getting the straps back on now....there's a guy on here who bought a moroso(i think) fuel door and put that over the whole he cut, it looked really sharp........
btw, who needs mechanical skills? hasn't stopped me
btw, who needs mechanical skills? hasn't stopped me
