Walbro pumps, do you have problems with the regulator ?
Thread Starter
Le Mans Master
Joined: Feb 1999
Posts: 9,946
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Walbro pumps, did you have to lower your fuel pressure after the install?
I was curious as to when you install a WALBRO pump if you need to lower your pressure on your regulator as the new pump causes a higher pressure, initially. I have a GNX fuel pump, and I have to back the screw all the way out to get a 39 psi. Before the pump, I had to turn it up.
[Modified by steve40th, 4:18 PM 1/24/2004]
[Modified by steve40th, 4:18 PM 1/24/2004]
Thread Starter
Le Mans Master
Joined: Feb 1999
Posts: 9,946
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Re: Walbro pumps, do you have problems with the regulator ? (R94 LT 1)
Have you checked your fuel pressure? And what about Air Fuel Ratio ? Mine got richer and my pressure went up.
Le Mans Master
Joined: Apr 2001
Posts: 7,411
Likes: 253
From: Little Elm TX
Re: Walbro pumps, do you have problems with the regulator ? (steve40th)
Have you checked your fuel pressure? And what about Air Fuel Ratio ? Mine got richer and my pressure went up.
Thread Starter
Le Mans Master
Joined: Feb 1999
Posts: 9,946
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Re: Walbro pumps, do you have problems with the regulator ? (R94 LT 1)
How did you custom tune your air fuel ratio? I had a chip burned, and used a Wide Band O2 sensor. The fuel pump increased my air fuel ratio from 12. 8 to 11.4, so I had to lean the fuel out with the regulator.
Le Mans Master
Joined: Apr 2001
Posts: 7,411
Likes: 253
From: Little Elm TX
Re: Walbro pumps, do you have problems with the regulator ? (steve40th)
The car was completely dyno tuned at Speed Demon Motorsports. My computer can be programmed. Doesn't have to have chips burned.
Thread Starter
Le Mans Master
Joined: Feb 1999
Posts: 9,946
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Re: Walbro pumps, do you have problems with the regulator ? (R94 LT 1)
I know the computer can be tuned, And I believe Speed Demon Dyno Tunes using a Wideband O2 sensor to tune your computer via a flash program, just the same way chips get burned for 93 and older , on the dyno.
What I was getting at was if anyone had to lower the fuel pressure back after the install of the pump to get there Air Fuel ratio back to what it was as the pump puts more pressure and volume in the system, and I thought this could richen a car up.
What I was getting at was if anyone had to lower the fuel pressure back after the install of the pump to get there Air Fuel ratio back to what it was as the pump puts more pressure and volume in the system, and I thought this could richen a car up.
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From: PITTSBURGH PA
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Re: Walbro pumps, do you have problems with the regulator ? (steve40th)
I know the computer can be tuned, And I believe Speed Demon Dyno Tunes using a Wideband O2 sensor to tune your computer via a flash program, just the same way chips get burned for 93 and older , on the dyno.
What I was getting at was if anyone had to lower the fuel pressure back after the install of the pump to get there Air Fuel ratio back to what it was as the pump puts more pressure and volume in the system, and I thought this could richen a car up.
What I was getting at was if anyone had to lower the fuel pressure back after the install of the pump to get there Air Fuel ratio back to what it was as the pump puts more pressure and volume in the system, and I thought this could richen a car up.
some of the buick guys are running two of those walbos and only have the second one kick in under full boost conditions to stay away from an overly rich condition at idle and low boost :cheers: