Does this sound like a dead fuel pump...?

[im4darush]

Car just shut off while driving. Factory relay is new and worked fine. Since the car just shut off I figure that is not the case since this is not a start/prime issue. Anyway, it died and had no pressure in the rail at all according the the gauge. Here is the interesting thing.....I had the car towed to a local shop where it sat over the weekend. This morning it fired right up and ran fine. Will a bad pump act this way sometimes? Mechanic tells me this is fairly common.

The car does have a caspers hot-wire. Fuses are good obviously since it fired today. Only question now is weather the relay in the front or back in the rear can cause it to just shut off, and then work fine a few days later.

 

[buickGN3:16]

There should be a relay under the bumper for the hotwire kit, test the voltage coming in & out of the realy, "key on" if it has juice its most likely the pump or bad connection going thru the top lockring on the tank down to the sender..


Posted from the TurboBuick.Com mobile app

 

[Shawn N]

Possible that the Casper's relay on the hot wire kit has got water in it. My kit was missing a seal on one of the wires and it would fill with water every time in rained or I washed the car. To eliminate the hot wire kit as a problem simply unplug it and go back to the stock configuration at the pump the next time it acts up.

 

[im4darush]

This car still has the factory pump in it so I'm going to use this opportunity to put a walbro in there. In terms of water, it was dry as dessert when it went out. Car has been in the rain before and never an issue.

 

[earlbrown]

With a factory pump it doesn't matter if it's bad or not.... Get that thing replaced yesterday if not sooner.

It's an easy job...
http://www.turbobuicks.com/forums/buick-v6-turbo-tech/54018-how-install-intank-fuel-pump.html

 

[im4darush]

Yea I figured as much that's why I ordered one. One quick question...I got the new walbro340 from full throttle and wondering if there is something specific with the install? I remember something had to be altered to the return onnthe older but notnsure if the new pumps are any different.

I'm at work in Atlanta and the car is in FL so my mechanic is doing the job. Wondering if I need to give him special instruction, or if it is self explanatory.

 

[HighMileage]

There is a jumper wire that goes to nothing behind the AC compressor. It puts power to the pump if you run 12V to it.
If you put 12V to that wire,do you hear the pump run? Definitely replace the stock pump if it is the stock pump,as Earl suggested.

Earl? Do you think this could be a relay or oil pressure switch issue?

Possible household breaker or knife switch candidate??

 

[earlbrown]

Earl? Do you think this could be a relay or oil pressure switch issue?

The relay and oil pressure switch run parralel to each other. The odds on both of them failing at the same time while driving, then both fixing themselves at night are pretty poor. It's a pretty effective redundant system (like on airplanes ) and works pretty well.



All cars need to be full of knife switches and romex wiring. That's been a rule since the caveman days.

One quick question...I got the new walbro340 from full throttle and wondering if there is something specific with the install? I remember something had to be altered to the return onnthe older but notnsure if the new pumps are any different.

I'm at work in Atlanta and the car is in FL so my mechanic is doing the job. Wondering if I need to give him special instruction, or if it is self explanatory.

Did you look at the link I posted?

 

[im4darush]

Sure did. All I could figure was chuck the pulsator and replace with provided hose. What's the downside to leaving it in?

 

[earlbrown]

The pulsator leaking and spraying your pressure all over the inside of the tank instead of sending it to the fuel rail. That article also showed a mod to increase the flow area of the largest bottleneck.

 

[longball]

[quote="earlbrown, That article also showed a mod to increase the flow area of the largest bottleneck.[/quote]

excellent article - a must read! (if only for the porn)

 

[earlbrown]

I put porn in that one too? I haven't read that one in a while. lol

That backup car did see some action. Not as much as the main one, but more than most.

 

[baby6]

My pump did that to me consistently. What happened was the original ground on the hangar was fried, the pump was getting excessively hot and shutting down. Put a new hangar in, and it has not done it since.

 

[earlbrown]

That's a good point too. When I was changing my pump over the the TT Supra unit, I noticed The tube that carries the ground had a cold soldier joint.

While I was there with the torch, I soldered a heavy gauge ring terminal onto the tube and on top of the hangar and ran that to the bumper shock bolt. That's the best route to get full grounding to the pump. Make sure to ground the frame up front too.