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| What fuel pump relay should I have? | |
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| Tweet Topic Started: Mon May 7, 2018 10:23 pm (258 Views) | |
| raglits | Mon May 7, 2018 10:23 pm Post #1 |
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Recently bought a 1988 2.0 injection and have been going through the faults one at a time. I now have the temp guage and rev counter working and the cooling fan kicks in at approx 100°C now, non of which worked when I picked the car up. However, when I turn the ignition on the fuel pump runs continuously, the hit idle is also higher than it should be. I went through and disconnected and reconnected all the vacuum hoses earlier and bench tested the ICV, checked continuity of the cables whether possible and all look good but I noted the part number down if the FPR and a quick Google search suggests the previous owner has out a 16v one in and I'm wondering how many problem this would potentially cause... So, back to the headline, what part number should my fuel pump relay be? Just in case it makes a difference, I have the TSZ ignition system |
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| raglits | Mon May 7, 2018 10:25 pm Post #2 |
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FPR currently in the car is 002 545 05 05 |
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| optimusprime | Tue May 8, 2018 11:10 am Post #3 |
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Reglits have you removed the fpr ?. It may be that its been hot wired on the pins this way the relay will never stop running and should never be used in this way .They do wire the fpr to check if its faulty or not. |
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| raglits | Tue May 8, 2018 12:04 pm Post #4 |
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I did pull the FPR yes, didn't see any shorts across the pins (admittedly I wasn't looking at the time). Just that I noticed during my searches that the 16v FPRs are different from the 8v ones and wondered if that was what was causing the issue. When I get a chance I'll go back out and make sure nothing is in the socket either to bridge the two pins. |
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| raglits | Tue May 8, 2018 12:06 pm Post #5 |
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These are the two relays in the car (half the air con equipment is missing so not sure the Klima relay will actually be doing anything...)![]() |
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| optimusprime | Wed May 9, 2018 11:04 am Post #6 |
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I think thats the wrong relay for your electronics in the picture the bottom one of the two is the fpr .This is the right one [picture] ![]() Edited by optimusprime, Wed May 9, 2018 11:05 am.
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| Peewee | Thu May 10, 2018 9:38 am Post #7 |
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If you want to give me the chassis number I can look it up for you. |
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| raglits | Thu May 10, 2018 10:33 am Post #8 |
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Thanks Peewee, PM sent |
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| raglits | Thu May 10, 2018 10:37 am Post #9 |
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Optimusprime, after looking at various schematics online I thought that was the most likely part number too. Hopefully Peewee will be able to confirm one way or another. |
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| optimusprime | Thu May 10, 2018 10:46 am Post #10 |
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Took that off ebay. |
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| Peewee | Thu May 10, 2018 11:16 am Post #11 |
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Here ya go A001 545 78 05 used without air con - inapplicable to retrofit/catalyst vehicles A002 545 05 05 only used with air con - inapplicable to retrofit/catalyst vehicles A003 545 20 05 - Applicable to retofit/catalyst vehicles |
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| raglits | Thu May 10, 2018 11:41 am Post #12 |
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Thanks Peewee, so according to that list the one I have is correct (no catalyst on the car and aircon was originally installed, compressor and dryer are still in the car). Need to get out there and check for pins being shorted then as the fuel pump continuously runs... What does the retrofit mean in those listings? |
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| Peewee | Thu May 10, 2018 1:38 pm Post #13 |
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It would appear you have the correct one for an air con non cat version. Retrofit, you have me there!! I'm sure someone here can tell us |
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| raglits | Thu May 10, 2018 2:01 pm Post #14 |
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Found it From that time, all gasoline-engined models were available with the option of a closed-loop emission control system with a three-way catalytic converter, except for the 190 with carburetor. As an alternative option, Mercedes-Benz also offered cars which were prepared for retrofitting, with a multi-functional mixture preparation and ignition system, but without catalytic converter or lambda sensor. Older cars could also easily be retrofitted with the closed-loop catalytic converter. These alternatives gave vehicle owners the flexibility to decide when to switch to a closed-loop emission control system. From September 1986, the carburetor model was also available with an emission control system, and the closed-loop catalytic converter became standard equipment on all gasoline-engined Mercedes-Benz passenger car models. Cars prepared for retrofitting were still available on request until August 1989, at a lower price than the equivalent version with catalytic converter. This is taken from this page... https://www.benzinsider.com/2007/03/mercedes-history-the-201-series-1982-1993/ |
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| raglits | Thu May 10, 2018 2:19 pm Post #15 |
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Looking at the timelines in that page, mine will be a retrofit car, being a 1988 without a cat, looks like I may need A003 545 20 05... I may just go to the local dealer and see if they can advise me
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| raglits | Thu May 10, 2018 6:04 pm Post #16 |
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Just been out and removed the FPR currently in the car and the fuel pump still runs with the ignition on... Don't see any shirting in the relay socket so I'm guessing a previous owner has hard wired the fuel pump to the ignition. Will explore that possibility over the weekend assuming I get some time... I'll get to the bottom of this eventually
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| raglits | Sat May 12, 2018 3:50 pm Post #17 |
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Been out and investigated the wiring, previous owner obviously had an issue at some point and decided to hard wire the fuel pump to the block by the drivers foot so the fuel pump always ran in "run" and didn't bother to repair the bodge when they got a new fuel pump relay. Disconnected this wiring and soldered the red and white wire back together, turn the key, fuel pump ran briefly then stopped. This is how it should be and engine starts too... Didn't have time to take for a test drive but hopefully all sorted now
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| Peewee | Sat May 12, 2018 10:09 pm Post #18 |
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Good stuff
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9:37 AM Jul 11