http://gallery.me.com/therimoldis#100071

Finally got my car back from the shop (new #22 head, cam, lifters) and there are still a few bugs to work out. My mechanic and I are trying to track down a weird surge under load which wasn't there before.

The car sat in my driveway for a few months with no head on it while I saved up the cash to have the work done. I seem to remember the primary having been quite a bit more full before, without the fuel pulsing.

I trust that the cam timing is proper and I watched while my indie set the IP timing today (with the little A & B light mercedes tool thing...kinda neat). The next thing we're going to check is the tank screen, then the lift pump. Primary and secondary are both new.

Anyone have any ideas? Is this normal?

Thanks .

Mine pulses, it's a piston pump driving.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

It most likely should pulse but the direction of the Fuel Pulse should only be one way. If it is pulsing back towards the Fuel Tank there could be an issue with the valves inside.

There is a Valve kit for the Fuel Supply/Lift Pumps.
I am not sure which kit yours will need but if the Pump has Disc Valves in order to get the Disc Valve out and into the Outlet Fitting a crimp needs to be ground off. There is a good thread on that in the DIY section.

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84 300D, 82 Volvo 244Gl Diesel