Inexistent fuel pressure...

So I have been scouring around for a fuel pump and all i can find is the assembly for waaay more money than i can afford since I just got done putting a new suspension on all around the car including sway bars/bushings/links.

My Question is Does anyone know the part number (prefer delco) for the fuel pump motor its self so I can get back on the road...? This is what i found at Advance Auto for a part number online but am unsure on the exact fit and psi performance Advance sells it for $85 and amazon $57. I just dont want this to be universal with alot of modification. I dont see why this would be so hard to find...

http://www.amazon.com/gp/product/B000C9TPGE/sr=8-1/qid=1321142385/ref=olp_product_details?ie=UTF8&me=&qid=1321142385&sr=8-1&seller=


I believe that this is my issue but this area is not my greatest for troubleshooting. But for the last few months about once every few weeks while driving straight down the road and once while turning a corner the car stayed on but the motor just cut off. pulled over and started up everytime with a little hesitation here and there. But now I went out to start the Riv and nada. It cranks but it wont fire. So I leaned waay back to listen for the pump and no buzzing sound at all. However a few times i did here a deep click like sound coming from the rear of the car but It was so short and quiet I cant pinpoint if that is just the fuel pump getting power and cutting off or if its something else.

Is there anything else that would be a bad part that relays power to the pump that could be causing this and the problem not actually be the pump but something else minor?

95 Riv S/C

RiverUPnGO wrote:

Is there anything else that would be a bad part that relays power to the pump that could be causing this and the problem not actually be the pump but something else minor?

Check for the fuses and wiring, also check for the Fuel Pump relay to see if it's hot, could have a short somewhere. Check for voltage at the connector in the fuel pump, the fuel pump is located in the trunk, under the carpet, right up corner, it should have 12V, if not you have an electrical problem, the pump should be on for 2-3 secs after you turn the key to the ON position. You can "test" the pump supplying 12V to "hear" for any noise like grinding or something. I recommend you to do more diagnostics before you purchase the Fuel Pump

sounds good ill check that out. i know it isnt turning on just a click noise and thats it. Where is the fuel pump rrelay located?

Should be on the back seat, you can try to to bypass the relay to power the fuel pump from there also.

if the fuel pump does work, then there has to be another problem, as the signal to "prime" the system to pressurize it comes form the PCM, worst case scenario replace it. but they don't usually go bad, So your problem should be fixed with just some diagnosis

Thats what I was thinking because the car is in a really good mechanical condition and I have been trying to get it more up to date with suspension and stupid stuff like this happens.

So By back seat you mean by the battery im assuming. But I will stick the meter on it in the morning and see what its reading. If its the PCM I will be uber pissed-off. I cant imagine how much that would cost...However if the pcm was bad I wouldnt be able to crank the engine I thought....

Very rarely does the PCM actually fail. It's usually a broken wire somewhere else.

Agree ^^^ with above post. I would not focus on the PCM at this point. If you find the fuel pump has failed, consider replacing it with OEM brand product, even though it costs more. The installation isn't something you'll want to do again and again just to save a little on the front end. Only buy the cheap pump if you don't intend to drive the car for very much longer.

But before doing anything, test the pump and wiring to be sure that's really your problem!

AA wrote:

Agree ^^^ with above post. I would not focus on the PCM at this point. If you find the fuel pump has failed, consider replacing it with OEM brand product, even though it costs more. The installation isn't something you'll want to do again and again just to save a little on the front end. Only buy the cheap pump if you don't intend to drive the car for very much longer.

But before doing anything, test the pump and wiring to be sure that's really your problem!

and you may be able to get an OK used pump from a junkyard or recycler like moradpartscompany.com

Soooooo....Its the fuel pump.... Been shopping and I cant find just the fuel pump, Just the whole assembly. I like Bosch but it always depends on the application and I dont know jack about their fuel pumps. Airtex? is that junk? Delphi?

Does this unit have a replaceable motor or do you have to buy the whole assembly?

ok Edit: I just found a remanufactured motor for it, by ReTech.

http://www.partstrain.com/store/details/Buick/Riviera/Retech/Fuel_Pump/1995/Base/6_Cyl_3-dot-8L/RETRE0216P.html?vdesc=true

Now is this an acceptable replacement if you were going to do this? Saves me a couple hundred...In my eyes I cant see why an OEM rebuild would be junk.

Get a price from monsterpartsonline.com for a competitive price on an OEM pump assy.

Also, people have mentioned NA pumps not being able to keep up fueling S/C motors. That retech lists the same pump for both motors. Is the '95 different in that regard?

In regards to the fuel pump assembly the 95 pump is the same regardless if its a s/c or n/a from evreyone that I have found. However I believe I found the motor to slip in as a replacement new from ac delco for 55 bucks on Amazon.that specifies 44 to 70ish psi. seems within spec to me.

RiverUPnGO wrote:

In regards to the fuel pump assembly the 95 pump is the same regardless if its a s/c or n/a from evreyone that I have found. However I believe I found the motor to slip in as a replacement new from ac delco for 55 bucks on Amazon.that specifies 44 to 70ish psi. seems within spec to me.

Yea thats the one i ordered. However now I a trying to figure out how to remove the pump off the top of the tank. I hardly fit in this trunk. lol. disconnected fuel lines and pb blasted the top after sucking all the sandy stuff off the top so it dont fall in the tank. So pretty much good to go replacing this except the removal part. is there a special tool? Ill browse forum for a bit to see unless someone beats me to the punch.

Alright well finished up everything yesterday morning and all is great wih the car in respect to the fuel pump issue.

Just wanted to say that the ACDelco motor on Amazon ($55 by the way)is a good fit(44-77psi). Not the exact one that i pulled out but it fit perfectly and I stomped on it for about 10 seconds yesterday with the cleanest acceleration I have had since I bought this car in Feb of 2011. Also more FYI the dealer sells the fuel pump cam lock and carries it usually for $5 and it to is ACDelco. Thats $10 dollars cheaper than carquest, napa or autozone who have to order the part anyways.

Oh yea one last thing, Make sure you have good shocks on your trunk when your hopping in the trunk or keep a leg out. My Dumbass as I was tightening down the access cover screws had a nice burst of wind come slam the trunk lid down on me and I was trapped in my trunk for 45 freakn' minutes until I found a flathead screwdriver and a lighter. Worst but funniest thing I have ever done with a car. Talk about freaking the hell out when that happened, no one was home. cell phone and keys were on top of car. lmfaorofl

Quote :

Dumbass as I was tightening down the access cover screws had a nice burst of wind come slam the trunk lid down on me and I was trapped in my trunk for 45 freakn' minutes until I found a flathead screwdriver and a lighter. Worst but funniest thing I have ever done with a car. Talk about freaking the hell out when that happened, no one was home. cell phone and keys were on top of car. lmfaorofl

OMG that has got to be the funniest thing I've ever read on this board! Thanks for sharing - and I'm very glad you didn't already have the fuel sender out when that happened. Being locked in a tight space with a clear opening to the gas tank is not a place anyone wants to be, especially with a lighter in hand!

Glad you're okay.

FREAKIN' HILARIOUS! EPIC STORY!

Too funny!
(also everyone keep in mind there is an emergency trunk release on the side that doesn't have the radio antenna. Often it gets pushed behind the carpet, but there is a nice pull cord to open the trunk.)

NOW you tell him, Andrew!

I had the carpet out and ther was nothing like that. I just went to check to make sure I was not any dumber while freakn' and theres no emergency release on mine. its a 95 so i dunno.

That's a gas cap release handle, not to open the trunk!

yea thats the only pull cable in there which i use all the time because i cant figure out how to get that damned burnt motor outta there.