97 Suburban - loss of power on hard acceleration

[v8_ranch]

Oh boy, I found a fitting to work on the filter. Got everything hooked up (used my fluke with pressure transducer this time). With cranking the car, I am getting 57 psi tops. I cannot believe this is the problem again. The pump that is in there is only 2 months old and is the Delphi unit. I am really irritated about having to drop this stupid tank again, but I am getting pretty effiecient at it now!

What amazes me though is why I have not been having any problems with it starting if pressure is this low off the pump? Does this still make sense, or could I be overlooking something stupid?

[MT-2500]

Verify fuel pressure with a gauge.

Also check voltage and power and ground to fuel pump.
The Delphi-AC pump should be under warranty if it is bad.
Good luck and let us know how it goes.
Good Luck

[v8_ranch]

Went to town and exchanged my 2 month old Delphi pump for a new one. Brought it back, installed it and checked pressure again at the filter. 80+ psi! I am still shaking my head about a pump like this failing in two months, btu the truck seems to be running like a champ again.

Thanks for all the help and information. It really helped me stay on track as I would have still tried to discount the pump if I had not been guided to check the actual pump discharge pressure and not just by crimping off the return line.

One note though for any who see this and do this in the future. You need to add a fitting to your collection in your fuel pressure test gage set (assuming you have one to start). The filter fitting is a flared fitting and as such will not thread to anything other than a flare fitting. You should be able to get these brass flare fittings from your favorite hardware store. I got a 90 deg fitting going from flare to NPT. I think it is 3/8" but I will try to double check and report back. Right now, I need to get home.

So then, any ideas on my other 2 posts. My transfer case problem is really bothering me as my wife is about to head west to SD. Would like to have the 4WD option again! ;-)

I also am looking for a recommendation on shocks, but have a separate thread for that.

Cheers all!

Shane

[MT-2500]

You are welcome and.
Thanks for posting back how it went.
Glad you got it running.

I extra thing do not run your tank low or below a 1/4 ttank of fuel.
Low fuel is hard on fuel pumps.
Good luck