Can you name this Component and its function?

[Joeyv]

Thanks guys. I think you nailed it with your assessments. I’m very confident that the car was originally a carbureted car (good call, GVS). I have receipts from a previous owner that show the removal of the carburetor and install of EFI, then removal of EFI and install of a carburetor, then injection being installed again. The EFI on it is an older style Felpro EFI from around 1995 (which was GVS’s point). The shop that installed it was named Fodge Engineering. GAZ64’s observation makes sense that the Carter Fuel pump is filling the alloy surge tank. There is also a Bosch High pressure pump (model: 0 580 254 984 0580254984 ) closer to the engine which I just replaced the same model non-functioning Bosch. The last owner had changes made so that it would be reliable on the track, so the configuration of the fuel system (at the time) must have made sense.

The shop said that the fuel pressure drops in 15 seconds or less. The shop said this particular EFI requires 6 lbs pressure per injector ( 48 lbs total). The Bosch fuel pump is spec sheet say it operates at 72 lbs. Next steps are to check inside the fuel cell to see if that is any crap in there from either Gas that evaporated out when the car sat, or crap from decomposing internals of the fuel cell (given that the car sat for about 15 years). Next, the fuel filters will be cleaned out or replaced (I did that when I was getting the car ready for the road, less than 50 miles ago). If the pressure still drops, the low pressure pump will be tested. From a cost perspective, I’m hoping to get the fuel system working with its current configuration, or with as few changes as possible.

The engine was running fine before it crapped out (the definition of a component failure, I know), so I am hoping there is crap in the fuel tank, or fouled filter, or low pressure fuel pump issue. If the EFI needs work, I may have a problem. There is concern that the software for the circa 1995 EFI may (probably) is out of support and that there may not be a cable to connect a laptop to the EFIs interface. I’m told replacing the injection could run $10 – 12 thousand (ouch), and conversion to carburetor $2,500 - $3,000.

The engine was first off checked for compression and bleed down, and there were no issues there. Mechanically the engine is fine, it is just seems to be a fuel delivery issue at this point. I’ll update this post when there are more developments. I really appreciated the input. I printed out the responses I received and drove down to the shop to update the guys working on the car. To their credit, they weren’t sure of how or why the fuel system was configured as it is, or what the function of the surge tank was, but they did know there was a simpler, less complex configuration that would work well on the car. Thanks!

[Gaz64]

Originally Posted by Joeyv

The shop said that the fuel pressure drops in 15 seconds or less. The shop said this particular EFI requires 6 lbs pressure per injector ( 48 lbs total). The Bosch fuel pump is spec sheet say it operates at 72 lbs. Next steps are to check inside the fuel cell to see if that is any crap in there from either Gas that evaporated out when the car sat, or crap from decomposing internals of the fuel cell (given that the car sat for about 15 years). Next, the fuel filters will be cleaned out or replaced (I did that when I was getting the car ready for the road, less than 50 miles ago). If the pressure still drops, the low pressure pump will be tested. From a cost perspective, I’m hoping to get the fuel system working with its current configuration, or with as few changes as possible.

Looks like your low pressure side is the culprit.

Disconnect the HP pump from power, take the return hose off from the surge tank, run a hose from there into a bucket, run the low pressure pump, and measure volume versus time.