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-   -   Question after replacing fuel filter and accumulator (http://forums.pelicanparts.com/porsche-911-technical-forum/978085-question-after-replacing-fuel-filter-accumulator.html)

83_Silberpfeil 04-04-2023 02:41 PM
Pete/Tony: just go back from garage, after completing 12 V test at FP terminals. I didn't get 12 Volts, but not 0 Volts either. Two readings: 8.7 V and 9.5 V. And resistance across the FP terminals at 0 ~ 1.5 Ohms.

During testing, the pump did not turn on, did not run; no sound, no vibrations. After the test, the FP was warm to the touch; definitely a noticeable difference warmer than other parts down there.

- FP relay removed
- jumper wire w probes in pins #30 and # 87a
- jumper wire toggle switch "ON"
- key at "ON" position

First Test w Multimeter MM:
MM + probe to FP + terminal
MM - probe to FP - terminal
MM reading: 8.7 V

Second test w Multimeter MM:
MM + probe to FP + terminal
MM - probe to cross member bar as a grounding point
MM reading: 9.5 V

Third Test, Ohms w MM:
MM + / - probes to FP + /- terminals
MM reading: 0 ohms ; sometimes 1.5 ohms depending on where I contact the probes .

boyt911sc 04-04-2023 07:34 PM
Quote:
Originally Posted by 83_Silberpfeil (Post 11962671)
Tony & PeteKz --- Reporting back. I put together a proper jump wire w a 20 amp fuse and on/off toggle switch. See foto below.

The result : FP not running; I stuck my head under the car, and hand touching the belly pan where the FP would be just above. Did not hear anything; did not feel any vibration, or any signs of a moving mechanism down there.

Here's what I did, exactly:

FIRST TEST:
- removed red FP relay
- inserted one jump wire (JW) test lead (TL) into slot # 30 (6 o'clock)
- inserted the other JW TL into slot # 87a (11 o'clock)
- toggle switch in JW is "OFF"
-inserted car key, move to "ON" position
- flipped JW toggle switch to "ON
- CDI buzzing goes on
- I crawl under car to listen, put hand on belly pan near the FP position --- nothing moving, no sound down there. FP not turning on.

SECOND TEST:
- one jump wire (JW) test lead (TL) into slot # 30 (6 o'clock)
- other JW TL into slot # 87a (11 o'clock)
- toggle switch in JW is "ON"
-inserted car key, move to "ON" position
- CDI buzzing goes on
- I crawl under car to listen, put hand on belly pan near the FP position --- nothing moving, no sound down there. FP not turning on. Same result.

What's next? Connect battery power directly to FP? What is the procedure? What equipment do I need?

Thanks!


Jonathan,

When you did the above tests, did you test or confirm if you were getting voltage @ terminal #30 and at the positive (+) terminal of FP? Have you applied 12-volt directly to the positive (+) terminal of the FP?

Use a 12-volt automotive test light for this type of work. The hardest part of this job is removing the skid plate under the car. Once you got the FP exposed, testing will only take a couple of mins. to determine if the fuel pump is good or bad.

If the tests show that the FP is bad, remove it and do a second test on the bench. If it fails again, whack it with rubber mallet or drop it to the floor a couple times and see if it runs or not. I have a box of defective fuel pumps and sometimes I could find a running FP by shocking it or dropping it to the floor. And use it for my CIS bench tester. Not recommended for car use.

I just realized that you have hijacked someone’s thread. You should had started your own thread.

Tony

83_Silberpfeil 04-04-2023 08:21 PM
You're right Tony --- I did hijack LIRS6's thread. I'll send him a PM.

Let me start a new thread to continue discussions here...http://forums.pelicanparts.com/porsche-911-technical-forum/1137700-1983-sc-reviving-after-4-years-dormant.html#post11964773


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