Anyone in Michigan with OB CIS knowledge?

Got home last night with no CIS gauges, held the FP relay to build pressure, car fired and I let go of the relay...relay stayed engaged and the car ran for approx 2 min, but when I lost pressure the car died...just wondering if the 044 pump may cure this...no visible leaks, and I can't smell fuel leaking anywhere so I don't know what is causing the loss of pressure, could be the cheap pump...got the CIS gauges on the way...didn't know if anyone had a spare 044 pump that I could get them to part with to try while I wait.

Thanks,
Josh

Hi Josh,
I do not know a lot about those pumps except the guys with boosted cars sometimes need the extra flow.
I think the correct person to talk to about that would be Roger at 928Rus.
He sells the pumps so he should know what is required, what is over kill and what would not work.

Let us know what he says.

Brad

What do you mean by 'holding the relay'? Are you using a jumper wire? Just want to be clear on why the relay itself isn't suspect?

For the injectors- they'll sing when adjusted right and the pressure is on- you just depress the plate on the air meter while the pump is energized..but be careful of flooding the cylinders. Best case is to have the injectors out and running into a container- preferably a graduated cylinder of some sort so you can compare the resulting flow across the injectors.

Loss of pressure could be the pump...could be a bunch of material that occludes one of the screens as the flow pushes it against the obstruction. One common point of failure is the brass union where the main fuel feed goes into the fuel distributor, it has a very fine mesh brass screen inside that gets clogged, could impede sufficient flow through the FD and might affect pressure. THough the way the system recirculates...seems an odd symptom unless the WUR is way messed up. The gauges will help to hone in on that.

There is also the system pressure regulator that screws into the body of the FD, maybe that plunger is stickign open.

Thanks all for the help...smtcapecod FWIW the screen mesh was checked by accident today (before reading your input) and yes, it was clogged solid, luckily I had another one from a different FD to install in the mean time until I get this one cleaned out. By holding the relay I meant engaging it by hand with no jumper. The relay is working as it should, but I fear my ign switch is on its way out. I tested pump flow and it is accurate for the system at this point. Going to get at it again tomorrow.

Thanks for the help all...many parts on the way.

Thanks,
Josh

smtcapecod;7280 wrote: One common point of failure is the brass union where the main fuel feed goes into the fuel distributor, it has a very fine mesh brass screen inside that gets clogged, could impede sufficient flow through the FD and might affect pressure.

Yes, I know of one 928 (not mine) that chased a problem for 1-2 years before finding this as the cause.

smtcapecod;7280 wrote: One common point of failure is the brass union where the main fuel feed goes into the fuel distributor, it has a very fine mesh brass screen inside that gets clogged, could impede sufficient flow through the FD and might affect pressure.

Stan.Shaw@Excell.Net;7296 wrote: Yes, I know of one 928 (not mine) that chased a problem for 1-2 years before finding this as the cause.

Yes thats right, that dam screen. I remember reading about that. It should have been the first place we sent you