Question about Oldsmobile Silhouette

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No fuel getting to fuel pump. I already replaced the fuel pump relay. Now I'd like to know what the voltage is suppose to be on the fuel pump. I have a 1991 oldsmobile silhouette

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Posted on May 20, 2011

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Need to know voltage from ecm to fuel pump relay for 92 firebird 3.1 mpi

should be 12.6 unless cranking the engine then it drops to around 10.5 but should be close to that autoshutoff relay might be out.. mine was..

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No Power to Fuel Pump

Tiffany - -I don't know when you first posted this question, but I am seeing it for the first time at 3:30pm on Wednesday.
The people who answer questions on this website are volunteers, nobody gets paid.
If you would like for me to research the wiring for the pump let me know.

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No power to gray wire at fuel tank

Keep in mind that this wire will only have voltage to it for two seconds after you turn the key on. It will take two people to check since you won't have time to run back and forth from the ignition switch to the connector to the fuel pump. Find the Fuel pump relay in the under hood fuse box and have someone turn the key on and listen for an audible click. The check for voltage again at the power wire of your connector within that ininitial two seconds. Let me know if you need further diagnosis. I've replaced quite few fuel pumps on these already. Just remember that when you turn the key on, you'll only have voltage for 2 seconds.

Aug 15, 2012 | 2005 Pontiac G6

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The fuel pump relay is the EFI relay in trhe fuse box under the hood right fender. I replaced it and the pump is working I can smell the gas. The truck still will not start. any sugestions?

Have you checked to see if it has spark at the spark plugs, let me know. Actually there are two relays for the fuel pump, the EFI relay and the circuit opening relay, the circuit opening relay gets voltage from the EFI relay. If the computer doesn't get a spark confirmation signal while cranking then the injectors are shut off.

Oct 22, 2011 | 1990 Toyota Pickup

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I'm working on a 97' Oldsmobile Siloutte. I thought that I was having an issue with the fuel pump so I changed it. However, it turns out that the old fuel pump wasn't defective. It's...

The PCM does not supply the voltage to the fuel pump . All the PCM does is energize the fuel pump relay ,closing contacts in side the relay which connects the fuel pump with a B+ voltage supply from Fuel pump fuse 15amp location , under hood fuse box . You have a high resistance problem in the wiring to the fuel pump . bad connection , corrosion etc... Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia

Mar 25, 2017 | Oldsmobile Silhouette Cars & Trucks

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97 grand marquis only getting 6 volts to fuel pump when key is on. through the ecm. replaced with a new ecm and still reads the same thing. why?

The PCM does not supply voltage directly to the fuel pump. It controls the fuel pump relay that dupplie the power to the fuel pump. The first thing you need to do is make sure there is 12 volts at the fuel pump fuse. If there is make sure there is 12volts at two of the pins at the fuel pump relay. If that checks out than you need to start looking for corroded wiring between the relay and the fuel pump. Corrosion = resistane which = voltage drop. Let me know what you find and i'll be happy to help you further.

Jun 09, 2011 | 1997 Mercury Grand Marquis

1 Answer

Whwre is the fuel pump relay for 95 mitsubishi diamonte wagon located?

Hi there,

You need to be certain the fault is due to the Fuel Pump Relay. Your vehicle's PCM will have stored the appropriate fault codes which are causing your problem. If you haven't already, have your codes read to confirm your fault.

The Fuel Pump Relay is actually hidden underneath the plastic 'centre' console (where the gear lever and ashtray are).

These are photos of locations, with the centre console/ashtray removed:





1) Without Battery Voltage: check continuity between connector terminals 2 & 4
2) With Battery Voltage: connect 12v battery power to connector terminals 2 (-) & 4 (+) . Then, check continuity between connector terminals 1 & 3. Refer to diagram below:


If the relay connector does not measure the correct continuity, then replace the relay.


"If this solution has helped you resolve your problem, please be kind enough to leave a testimonial"

Jun 04, 2011 | 1995 Mitsubishi Diamante

1 Answer

1994 ford ranger xlt 2.3l. having trouble with the fuel delivery system. pump doesnt prime or cut on at all ( itll jus quit when im driving) but mostly when i slow down to a complete stop my truck will...

Rather then just replacing parts testing the fuel pump electrical circuit is the proper way to diagnose . Do you know how to use a DVOM - digital volt ohm meter , how to use a wiring diagram to pin point testing points in a electrical circuit ? How to use voltage drop testing in a circuit to find which part of the circuit has the problem B+ or ground side . Yes it can be very agrivating if you don't know what your doing . Testing for power at the relay an testing for control . The PCM - engine computer controls the fuel pump relay ! Here is a web site for free wiring diagrams ! Enter your vehicle info. year , make , model an engine size ! Under system click on engine , under subsystem click on fuel controls . Click the search button an three links will pop up . Click the first one .Buy yourself a volt meter an watch this video an learn .
Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia
Learn the two sides of the circuit .
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2 Answers

Fuel Pump Relay Switch

Underneath your hood, behind the passenger side headlight, behind the core support, is a bank of 2-8 relays. One of those relays is the relay needed for your fuel pump. There will also be a fuel pump relay fuse located there. The relay designation should be on the cover of the relay compartment.

Jan 03, 2009 | 1989 Pontiac 6000

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