I installed a Bosch 044 fuel pump about 6 months ago on my
Jaguar LS1 swap. The pump makes a surging sound at random
every second or two, almost like it’s getting a little gulp
of air or something. It’s done this since the day I
installed it. It does not matter whether the tanks are full
or empty, or if one tank or another is selected. Under heavy
throttle and/or high RPMs, the car will hesitate, almost
like it’s running out of fuel or the spark is being shut off
just for an instant. If you keep your for in it, the car
will jerk back and forth pretty violently. The problem got
worse on my way home today… worse than it’s ever been. It
actually stalled a couple times while cruising, but started
right back up.
Normal Bosch 044 on youTube sounds like this:
My Bosch 044 sounds like this:
I tested the voltage at the pump, and it’s dead steady,
reading the same as at the battery posts.
Here’s a youTube video of my pump. It is not a constant
hum. You can hear the surging. Be aware that the Bosch 044
is a very noise pump.
The pump is installed inline where the old pump was. There
is plenty of fuel in the tanks. I have a 100 micron
stainless steel mesh cartridge Trick Flow fuel filter that I
installed on the inlet side of the pump. It’s all 1/2’’ fuel
hose from the tanks, through the fuel tank selector valve,
through the filter, and to the pump. There is also an LS1
Corvette filter/regulator in the engine bay. The tanks have
plenty of fuel. The pump and inline filter have about 700
miles on them.
Also noteworthy - the pump that came with the car got noisy
like this before I replaced it. The car also started cutting
out under load and high RPMs. The problem largely went away
when I installed the new pump, but not entirely.
What the heck is going on here? Any thoughts?
The archives and FAQ will answer many queries on the XJ series…
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