I'm using an iPad so bare with me. I came across this site while googling for some info about the issue I am having with my magnafuel 4703 pump and it seems like a handful of you are pretty knowledgable about setups with these big electric pumps. For what it's worth the car isn't a ls1 but figured it would be worth a try posting here.

Since day 1 the pump has never sounded smooth. It makes a whurr,whurr,whurr, pulsing noise. I am traveling for work so cannot get a video right now but the video below is exactly how it sounds.


At first I took it as the nature of the beast and didn't pay much attention. Put 20 miles on it testing another new blower setup, and a few dyno pulls. The car was ridiculously loud at this point so while running I couldn't hear much of the noise the pump made. After the dyno I decided blowers were getting boring and went with a new turbo setup. After the turbo the car is significantly quieter and I kept hearing a tick like an exhaust leak. Sure enough it's coming from the pump, along with the pulsing noise. 100 percent sure it's from the pump as I can just kick the pump on and hear it clear as day. Any ideas as to what could be causing this?

Setup is below.

Glenn's performance sumped tank pump is mounted about level with the top of the sump
-10 out of tank with a 90, 90 into a magnafuel 74 micron filter, straight out of filter with a 90 into the pump
-10 from the pump with a 90 to front of car where it Y's odd to 2 very short -8 with 90 to the rails, along with a magnafuel 25 micron filter mid length of the car
Magnafuel 9950-b regulator mounted on the end of one rail with a coupler and hooked to other rail with -8 and a 90 on the rail and regulator
-8 return with a 90 at the regulator and 90 at the tank
Powered by a fore innovations "controller'. Not a true controller it is pretty much just a pretty 3 in one relay box rated for 30a on each circuit.

Being that I'm not home I had my wife take the gas cap off, kick on the pump and send me a video. No change in sound so that rules out a venting issue I would image. Flap on the filler neck was held open as well. Apart from that I'm a bit lost on what the issue could be as I'm pretty new to these large pump setups. Before this I ran a 3 walbro gsl392 pumps with the lines routed the same apart from the feed line to the pumps and had no issues.

Thanks