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Evo 9 lean at high rpm after Walbro 255 install

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Old Aug 19, 2015 | 11:03 AM
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soderdna
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From: ontario
Evo 9 lean at high rpm after Walbro 255 install
I just got back from a tuning session with disappointing results. My tuner told me the car was leaning out at high rpm and the IDC's were hitting 108%. I only have basic bolt ons (intake, catless downpipe and licp) and I installed a walbro 255 just as room to breathe. He suspects the o-ring seal might be poor and is leaking pressure up top. Any other ideas? I'm gonna pull the pump to see if I missed something. I put it in with the install kit so it has a new strainer. Car runs fine otherwise.
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Old Aug 19, 2015 | 11:28 AM
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From: 3rd Rock {from = sun}
Originally Posted by soderdna
He suspects the o-ring seal might be poor and is leaking pressure up top. I'm gonna pull the pump to see if I missed something. .
So. What's the hold up?
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Old Aug 19, 2015 | 11:30 AM
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soderdna
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From: ontario
Originally Posted by Ev0ikon
So. What's the hold up?
Lol I need to get home first! Just seeing if anyone has encountered anything similar
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Old Aug 19, 2015 | 11:33 AM
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From: 3rd Rock {from = sun}
Yeah. What you mentioned is the most popular failure at higher fuel pressure. Get you a fresh rubber grommet.
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Old Aug 20, 2015 | 07:42 PM
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From: California
Originally Posted by soderdna
I just got back from a tuning session with disappointing results. My tuner told me the car was leaning out at high rpm and the IDC's were hitting 108%. I only have basic bolt ons (intake, catless downpipe and licp) and I installed a walbro 255 just as room to breathe. He suspects the o-ring seal might be poor and is leaking pressure up top. Any other ideas? I'm gonna pull the pump to see if I missed something. I put it in with the install kit so it has a new strainer. Car runs fine otherwise.
Are you still on stock injectors or aftermarket?
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Old Aug 21, 2015 | 11:24 AM
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soderdna
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From: ontario
Originally Posted by ms32evoixmr
Are you still on stock injectors or aftermarket?
Stock e9 injectors. I think 580's
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