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Holley sniper any tips?

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Old 04-15-2018, 05:06 PM   #1  
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Car: 1989 firebird formula
Engine: 350

Holley sniper any tips?

I just installed a Holley sniper TBI on my 89 formula. It was originally a 305 TBI car I have upgraded the fuel pump to a walbero 255. When I installed the unit I didn't use the supplied fuel pump wire because it already had the TBI originally but I'm thinking the fuel pump doesn't run enough to prime up to the 60 psi needed for the sniper because I usually have to cycle the key twice. Does anyone have any experience with this? Thanks all!!
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Old 04-15-2018, 06:27 PM   #2  
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Re: Holley sniper any tips?

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Originally Posted by kenwood1609 View Post
I'm thinking the fuel pump doesn't run enough to prime up to the 60 psi needed for the sniper because I usually have to cycle the key twice. Does anyone have any experience with this? Thanks all!!
​​​​​
Seems reasonable. All the GM cars I know of that run higher fuel pressure also retain pressure at least for awhile. The TBI system is not designed to hold pressure, so it's building pressure from "0" each time it's started.

The ECM is responsible for the two-second prime cycle. Maybe there's a way to "tune" the ECM to provide a 4- or 5-second prime cycle.

'Course, the fuel pump should be running if the engine is being cranked by the starter motor. Long crank time before engine run is also associated with a failed fuel pump relay or relay harness. Does the fuel pump relay work without excess voltage drop?
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Old 04-15-2018, 06:40 PM   #3  
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Re: Holley sniper any tips?

The Holley comes with a fuel pump control wire so I guess what I was wondering is is I can just tap into the fuel pump relay under the hood and have the Holley sniper control the pump.
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Old 04-15-2018, 09:27 PM   #4  
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Re: Holley sniper any tips?

Yes, you can trigger the relay with the Holley wire. I did that on my Holley HP. You can NOT POWER the relay with this wire.
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Old 04-18-2018, 10:07 AM   #5  
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Re: Holley sniper any tips?

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Originally Posted by Abubaca View Post
Yes, you can trigger the relay with the Holley wire. I did that on my Holley HP. You can NOT POWER the relay with this wire.
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