Tom M'Guinn

For those of you who have actally installed the 044 pump in their 951, do you hear it? My pump doesn't seem to make much noise, but I am getting a tapping sound at idle, the frequency of which corresponds to the pulses in the fuel lines. Does everyone get that, or should I try to isolate the lines/punp better?

azmi951

i just get a humm. I mistok it for static from the speakers at first.

special tool

Mine taps..
Its up around the braided fuel liines.

RolexNJ

As you know, my old one made a sound the seemed like a slight clunk. Could hear it the most at idle coming from the back right. Ask ST, he installed it, he should know. Told me get used to the Big Moma, it makes some noise.

David Floyd

It's not just on the 044 that the tapping shows up, I use one of the Bosch pumps that Lindsey Racing has sold for years and I also get the tap.

In summer temps it is not so loud but now that the temps are cooler very pronounced at idle.

hot-J

Mine does no tapping or makes any noise at all! Oh, wait..... Nevermind. Its still on my dining room table.

KuHL 951

Sounds to me like the stock fuel dampener is probably undersized now for the larger capacity pumps and you get a pressure hammer. Anyone ever try a larger FD unit or is one even made? One way to find out is plug it off completely and see if it gets any louder.

Tom M'Guinn

Well, 5 minutes of investigation tonight -- it seems to be coming from the lines toward the back. If I put my ear against the body down by the rocker panel, I can hear it knock like someone is using a little hammer. At least that will help isolate it without planting someonoe in the car. My plan is to jack it up over the weekend and look for places where the lines are touching the body -- adding rubber insulation where it touches. Wish me luck -- tips/suggestions welcome.

special tool

HHHHHmmmmm ..... you are right, as usual.

tconn

Mine just makes a normal electric hummmm. As David says it's louder when its cold out.
No tapping.

theedge

My Bosch High Volume pump doesnt make any tapping sounds, just a hum/whine from the pump and a whoosh in the lines and rail. Although this is with the engine off Theres also a steady vibration that can be barely felt in the floorboards with just the pump running, but this is probably because I didnt use the suppoistory pill to mount it, just some sections of silicon intercooler hose.

Bosch HV, cheaper style braided fuel lines, Billet AFPR.

ninefiveone

This reminds me of a hysterical response from back in the day on the list asking if people heard whining from their fuel pump.

"Is it cold where you are? Most likely the whining is due to your female fuel pump. They typically are dressed for warm-weather and when it gets cold, you get a lot of whining noises. Replace with a larger volume male pump and you should be fine..."

Tom M'Guinn

Well, a bit more investigating tonight... As best I can tell, the noise is not the result of fuel lines banging on the floor boards or fenderwell, but haven't ruled it out 100%. The actual source of the noise seems to be from the FPR/damper and fuel rail (I can feel the FPR/damper pulse pretty hard) meaning the noise is just resonating in the body and coming up in the megaphone-shaped tt tunnel. Thoughts/suggestions?

KuHL 951

Again, you might look into a larger dampener if Bosch makes one for the same fittings. Think of it as a surge tank; the air gets compressed and forms a cushion to flatten out surges. Too much pumping and not a enough cushion and you'll get a hammering sound. Lindsey had this same problem in there first fuel rails.

Tom M'Guinn

Steve, I just spent the last 20 minutes reading old posts about the LR fuel rail noise -- even saw that Lidsey already tried what I did tonight -- wedging rubber between the fuel lines and body. Ski posted about a temp fix, but the pictures were red x's. Anyone know if Lidsey ever found a solution?