Update on Zilla's porting and lean/KR problems - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 10-07-2005, 12:12 PM   #11
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Do you have an A/F gauge?
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Old 10-07-2005, 12:17 PM   #12
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Nope. But I have a scantool.
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Old 10-07-2005, 12:23 PM   #13
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I know I am NA'd but with the new pump, when I dissconnect the Vac line from the FPR I get 52 Psi, and it pretty much doesn't drop with demand...

Before, It was 47-48 with the vac line removed, But as soon as the throttle was tipped open the fuel pressure would drop like a rock... I saw points as low as 32psi... My car should run 48-55 Psi which it does after the new pump...

Bill with 115,000 plus on the 95, and the 93 having sat up for better than 5 years, I am not supprised that you are finding the fuel pressure low...

I knew there was an issue when I found that the 91 Bonnie had a lot better pressure than the 95...LOL... 15 Years and the pump is still holding on...LMAO


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Old 10-07-2005, 01:23 PM   #14
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Quote:
Originally Posted by willwren
Nope. But I have a scantool.
I ask cause the behavior could tell you FPR or pump.

If it'* just lean consistantly at a certain throttle, it'* the FPR.

If it gets leaner as the RPM'* climb, it'* the pump.
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Old 10-07-2005, 01:26 PM   #15
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Leaner as it climbs. And it bleeds down immediately after priming on both cars.
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Old 10-07-2005, 01:29 PM   #16
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Bill, don't let me forget to dig out the 4bar regulator. It should fit your rail and will tell you if it is pump or regulator.
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Old 10-07-2005, 01:40 PM   #17
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Quote:
Originally Posted by willwren
I'm looking at the Walbro, but I want solid numbers for comparison between pumps first, both Pressure and Flow rate. OEM vs. Walbro, considering they're basically the same price. Also, IIRC, the Walbro has an adapter harness that has to be spliced in, and I'm not sure if the strainer sock (OEM) attaches to it. I've got some feelers out on this stuff.
If you're going to get a Walbro fuel pump I suggest going through this guy. The kit is $93. Free shipping on all orders over $50 too.
http://www.autoperformanceengineering.com/
That page also has flow rates for the pumps as well, in the Technical in tank fuel pump page.

You do not have to splice the harness in. I didn't I went to the local parts store and bought the GM metri-pack terminals. CarQuest #TA717. Pulled the factory terminals out of the connector, cut the Walbro harness to length. stripped the ends and put the terminals on. Then all I had to do was place the terminals back into the connector. A much better way IMO than splicing into the SMALLER OEM fuel pump wires.

The pump itself didn't need much to install. had to trim the pump support bracket at the bottom. The Walbro Pump inlet is much larger than the factory inlet.

Hope this helps.
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Old 10-07-2005, 01:57 PM   #18
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Did that come with the strainer sock? I know another source I found does include it.

I think I'm also going to need the o-ring for the tank seal from GM. I need to figure out what I'll be lacking if I order the Walbro.
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Old 10-07-2005, 10:29 PM   #19
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Quote:
Originally Posted by willwren
Did that come with the strainer sock? I know another source I found does include it.

I think I'm also going to need the o-ring for the tank seal from GM. I need to figure out what I'll be lacking if I order the Walbro.
Yes, the Kit comes with the strainer. and everything you see in this picture.


Yeah, you'll probably need the tank O-ring. mine was pretty dryrotted when I pulled it out.
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