BIG fuel pressure drop at WOT?

NSSANE02 · 10-26-2009, 01:58 PM

I have read a shit ton of threads in searching that have had small pressure drops at WOT but nothing like this. I recently had my car go very lean at wot and found out that the fuel pressure is dropping from ~53psi at idle to as low as 30 under wot in the higher rpms. I don't think it was a gradual change either since I went from a steady afr on one pass to a VERY lean afr on the next. I have a racetronix pump in my car that has about 3k miles on it. I never put in a hot wire kit so I was going to try that but I don't think that's going to help at this point. I just changed the filter also but no change in pressure. It seems to me like the pump just took a shit but I want to make sure before I get a new one. What do yall think?

Greenbird97 · 10-26-2009, 02:45 PM

It kind of sounds like the pump, my buddies would do that but his would drop so low the engine would shut off, but he had a 170,000 mile original pump too...

Old Geezer · 10-27-2009, 08:51 AM

Hose split??

NSSANE02 · 10-27-2009, 10:04 AM

Quote:

Originally Posted by Old Geezer

Hose split??

I checked all the lines I could see without pulling anything apart, didn't see any damage. I'll be pulling the pump when I get my work truck back and checking things a little more in depth. I guess if I don't find any visual damage I'll have to order a new pump and hotwire kit

BOWTIE · 11-07-2009, 02:30 PM

Any verdict yet?

NSSANE02 · 11-14-2009, 06:33 PM

Nothing yet. I've had some other things to deal with but I'll be pulling the pump soon and possibly replacing it so I'll post up what I find.