I currently have a series 1 and the stock fuel pump does fine, for the series 2 I am going to use the older turbo Trans am fuel pump, it is around $70 and is a direct replacment.
------------------ '87 GT 93 3800sc series I / 4t60e 7.597 1/8mile ET 1.579 60' 88.53 mph
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11:30 PM
The Aura Member
Posts: 2290 From: Winnipeg, Manitoba, Canada Registered: Nov 2001
As I have stated in countless threads before, the 3800II SC engines require higher fuel pressure levels than N/A engines. The 96 vette, stock Fiero, etc pumps are designed to operate at a MAXIMUM of 43.5psi and maintain their required flow rate at that pressure. This doesn't mean these pumps are incapable of higher pressures, however it does mean that at higher pressures their flow volume capacity drops off sharply -- it has been a proven, tested FACT.
With that being said, the 89 TTA fuel pump would be the ONLY CHEAP ALTERNATIVE if you want to skimp on swap costs. At least it is rated to flow enough fuel at the higher pressures. The Vette pump is not rated to flow at the higher pressures but at least it is better than trying to use a stock Fiero pump. There have been many people who have blown up their 3800SC engines when they tried using a stock pump. In my honest opinion, a $1000-$2000 engine is not worth the cost of a nice $129 Walbro 255lph unit.
------------------ power corrupts. absolute power corrupts absolutely. Custom Computer Tuning | Engine Conversions | Turbocharging | www.gmtuners.com
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12:41 PM
mattm Member
Posts: 1647 From: lancaster, pa Registered: Aug 2003
As I have stated in countless threads before, the 3800II SC engines require higher fuel pressure levels than N/A engines. The 96 vette, stock Fiero, etc pumps are designed to operate at a MAXIMUM of 43.5psi and maintain their required flow rate at that pressure. This doesn't mean these pumps are incapable of higher pressures, however it does mean that at higher pressures their flow volume capacity drops off sharply -- it has been a proven, tested FACT.
With that being said, the 89 TTA fuel pump would be the ONLY CHEAP ALTERNATIVE if you want to skimp on swap costs. At least it is rated to flow enough fuel at the higher pressures. The Vette pump is not rated to flow at the higher pressures but at least it is better than trying to use a stock Fiero pump. There have been many people who have blown up their 3800SC engines when they tried using a stock pump. In my honest opinion, a $1000-$2000 engine is not worth the cost of a nice $129 Walbro 255lph unit.
Walbro just released a replacement for the 307 and 340, the F2000169. It flows 255lph @ more than 70psi and if you purchase it with the 87-92 GM install kit from http://www.precisionturbo.net/ it is a direct drop-in, plug-and-play replacement for the 87-88 Fiero.
I keep hearing people talk about how you should not use the stock GT fuel pump with the 3800SC, I for one "USED" to be one of them.
Tonight I swapped in a E3270 (89 TTA) Pump and not only is this pump not so loud but the car does seem to be smoother, it does not make any change to power that I can feel but the car seems to be more smooth and the idle is about 100 times better.
So for $75 bucks at the parts store you can't go wrong, plus like Darth said you spend thousands on the swap and make it limp with the stock pump and risk damage. Not a good idea.
