Time for a new fuel pump

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Sep 8, 2005 | 02:00 AM

buffman

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From: Kzoo, MI

Time for a new fuel pump

I'm trying to debate this one. Okay. I had run some datalogs a few weeks ago at the track (With a friend's laptop) to see if everything was going aokay. My friend said everything looked good. I had sent the log to another friend and he said it looked like the fuel pump was not keeping up in the higher rpms.

This is what the one friend said

Quote:

I saw the WOT O2 readings drop as he got through the RPMs. Graph the O2's and you'll see what I mean. As soon as the shift is made, it takes a jump up and then drops some more until Cat Overtemp kicks in (3rd gear I believe) and dumps fuel to compensate (12:1 AFR). I see that as evidence of the pump not supplying enough fuel. Given his mods (not many fuel happy mods) and 150k on the pump, I'd say the pump.

So I did some testing. I have 14v at the battery and 13V at the fuel pump. (stock wiring harness for fuel pump) Pressure at idle is 32psi. Pressure at idle w/ no vacuum on FPR 42psi. Pressure I noticed at WOT is 40psi and what looks like it drops maybe 2psi as rpms climb.

The Fuel Filter has less than 10k on it (bought last year) and the fuel pump has 150k on it. I figured even w/ 150k it prolly would be a good idea to change the pump out anyways. So what do you guys think? BTW I own a Roadmaster but I would imagine the fuel system setup would be the same as an LT1 F-body.

I have the datalog here if anyone wants to view it for themselves, as I'm new to it and don't know a whole lot about it.

http://www.regionofdoomforum.com/Upl...talog3runs.zip

Thanks in advance

Matt

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