Clarification Fuel line, regulator, damper test 3.2 Carrera

[88911coupe]

I have read several threads and can't seem to find one that answers my questions. Engine out and rebuilt fuel lines. I can jumper the pump to get it to run but plan to partially install the engine and hook up the pressure/in fuel line and hook up the return line back to the tank, or into a large gas tank to empty old fuel. injectors are installed after being cleaned and rebuilt. My question is can I effectively test all the lines AND the regular and damper since there is no vacuum to either since engine not running? Not sure what impact no vacuum has on the workings of the regulator and damper. I have found reasonably priced generic replacements for both if I need to.Hopefully this is clear.

[Discseven]

Buck... I thought of the same interests and went ahead with "bench" testing the new fuel lines (and injectors.) Having no issue with the regulator or dampener prior to the fuel line (system) rebuild, the assumption was both those parts were good. Way I approached "benching" was to run extended fuel feed & return lines from the car to the completed manifold while it was outside the car. Fuel lines were inspected for integrity, pressure (I built-in a psi gauge), and with the manifold off the engine, the flow volume and pattern of each injector was checked.





Static pressure was off a few psi. Greater than spec. With all else going on at the time, I ignored that. Most importantly the new fuel system did not leak. Injector testing proved all 6 working nicely. If you injector test, it must be with the correct voltage. Hooking 12 volts to an injector is bad. There are specific testors for this. I did not answer your "vacuum" question but perhaps provided some other things worthwhile.
.

[ErrorMargin]

Franny mentioned in this video that she sent her regulator and damper out to be tested…

https://youtu.be/ok6tUYQrxtQ?si=eglNqYjkIncjN8d-

[88911coupe]

Karl, that is an interesting setup. I didn't realize the injector will fire when this is done. I guess the fact that there's not vacuum does not keep the fuel from flowing? Regarding the video I never even noticed they sent the regulator and damper out to be tested. To the best of my knowledge mine work fine but they are over 35 years old. I don't have any data to show they should be failing soon or not. I have found both the regulartor and damper from Standard Motor Products which have been used by others successfully. I may just buy them as a backup and send mine out to be tested. I know they can be changed with the engine in the car but since my engine is out it would be nice to change them IF they need to be changed.

[Discseven]

Buck, system including injectors were tested with the car's fuel pump running. This requires hot wiring the pump in a 3.2 when engine's not running. To pulse the injectors, something like this is needed...

[88911coupe]

Thanks Karl, very helpful. I did run the pump and just hooked up some fuel hose to the "OUT/Return" line into a gas tank and I did not detect any leaks. I pulled the vacuum hoses off of the regulator and damper and no fuel smell was detected. I would think if the diaphragm was torn there would have been fuel smell.

[Discseven]

Originally Posted by 88911coupe

Thanks Karl, very helpful. I did run the pump and just hooked up some fuel hose to the "OUT/Return" line into a gas tank and I did not detect any leaks. I pulled the vacuum hoses off of the regulator and damper and no fuel smell was detected. I would think if the diaphragm was torn there would have been fuel smell.

That's a clever test on the diaphragms Buck. I missed doing that. Next time...Thanks back to you

[88911coupe]

The dilemma I'm facing now is should I just replace the damper and regulator with the "generic" versions others have used, or leave the functioning parts on the car. I don't have any info as to how long these original parts typically last.