Question about 1984 Alfa Romeo Spider

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No electricity to the fuel pump ...if I remove the pump and hook it up to a 12v source it works fine...hook it back up to the two wires on the car..nada

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Well all your problem should be is either the feed to the pump is not there OR the earth wire isent earthing SO get a test light put 1 end to any part of engine and the other to the pump feed wire if it lights up then you have feed so its the EARTH so fit a new earth wire from engine or body to pump and away you go,,,,,,But make sure that the petrol pipes on on the correct way

Posted on Oct 03, 2009

Testimonial: "haven't tried the fix yet.. but I've heard that grounding strap issues are the #1 bugger on these and it hadn't occurred to me to check them Thanks"


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1 Answer

How do i check fuel pump and fuel pump relay

Hi Greg
Disconnect it's cable connector if possible.
Use a MultiMeter and a couple of jumper leads to +12v & ground.
Or the cheap tester below will help.

Sometimes this is better done on the bench where you can see whats going on.

Relays are just using a 12v low current electromagnet being used to close a set of internal switches (contacts) to supply 12v to the Fuel Pump. The Relay Contacts carry a higher current than th fine thin wiring used on vehicles these days.

The fuel pump can be tested & run without the relay to prove it is working. Use jumper wires to Battery.

The relay can also be actuated (tested) using jumper leads & a multimeter. When the internal coil is energised it simply pulls switch contacts closed. A Multimeter across the contacts pins will prove this.
Relay Pin Numbers
DIN 72552 defines contact numbers in relays for automotive use;
  • 85 = relay coil -
  • 86 = relay coil +
  • 87 = common contact
  • 87a = normally closed contact
  • 87b = normally open contact

Relay Wikipedia the free encyclopedia

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Dec 28, 2015 | 1992 Mitsubishi Mighty Max

1 Answer

Trying to figure out fuel pump. will not energize when ignition is on. Fuel sending unit works fine but will not deliver fuel.

unknown vehicle so generic answer check and test relay --also check the connectors for corrosion-and ground connections

Jun 25, 2017 | Cars & Trucks

1 Answer

I have a 2000 beetle it won't start it cranks but won't turn over mechanic but it on the machine and it said the crank sensor was bad he fixed that in still wouldn't turn over so he put it on a different...

If there is no pressure at the fuel injection manifold, it indicates that the fuel pump is not being activated when you turn the ignition switch to start. This condition may be caused by a blown fuse, a bad ignition switch or wiring to the fuel pump, or a failed fuel pump. Check the fuse, then check the fuel pump by disconnecting the electrical connection at the fuel pump and applying a 12V battery source to the fuel pump. If the pump works, check the ignition switch and the wiring.

Feb 20, 2015 | 2000 Volkswagen Beetle

1 Answer

1991 subaru legacy sport (turbo). Electrical fuel pump issue. the pump works, used an external 12v source with pump removed from vehicle, currently reinstalled. battery is charged, (sbfd fuse #2) is...

if there is no power coming out from the relay, that will be the problem. as you said it is new,check it manually by connecting the terminal into the power source and check the continuity of the the output from the source.
Sometimes there is new parts that has a manufacturer defect. try another relay.

Hope that helps you out!

Aug 14, 2011 | 1991 Subaru Legacy

1 Answer

1987 Jeep Cherokee-4.0L I6 auto tranny 4WD. Fuel pump will engage if straight wired but not if plugged in, engine will crank but not turn over, checked all relays & relaced battery cables &...

If you turn on the key and you do not hear the pump in the tank running for two secounds ( the same time your warning lights on your dash light up and goes off) then 1 you need to replace the pump or 2 it has low voltage to the pump or 3 both. I just repaired a 1987 pioneer what you need to know is the pump requires 12v at the pump, however OEM has placed an inline ballast resistor located on the driver side front engine compartment near the hood latch that is made of white ceramic with two connection both wires are orange with a black stripe. A. Check the voltage on both sides of the resistor 12v in 12v out use a volt meater - to battery + to resister if no voltes check the relay the passenger side of the engine compartment ( there is 4 relays from front to back it is no. 2 from the battery) looks like a small blue box newer relays are black, if they do not click when the key is on then your CPU may be bad or fusible link is bad If you have voltage to the resister and you have 12v in and less than 12v out your next test will be at the rear connector to the pump, three wires close to the fuel filter using a volt meater check the black wire with the orange / black stripe if voltage is less than the voltage out of your resistor then there is a bad wire in the system and a new wire is required. confirm this by jumping the battery to the pump wire black to- and orange to + the pump should run. Note. running the pump with lower than 12v will damage the pump and cause it to fail! If the pump works you can check the fuel pressure on the fuel rail, remove the cap to epose the shearder valve (looks like the valve on your tires) depress the valve stem and fuel should come out, caution fuel is under pressure have a rag under the valve to catch the fuel, if low pressure the pump is bad and/or filter is plugged Replace filter first recheck this test then replace pump and recheck. Note!!! when the pump is out of the tank recheck the voltage at the pump this will show true voltage at the last connector it needs to be 12 volts! Reconnect the pump wire the stock wire and check, on the pioneer I worked on was 4 volts so I rewired it to a new battery source using the orange /black strip wire that had 12v in to resistor as a trip wire for a 65 amp power relay. The owner noted an increase in overal performance " it now has more power now" hope this helps

Feb 23, 2011 | Jeep Cherokee Cars & Trucks

1 Answer

Camry just quit running. I can't hear fuel pump,

The engines oil pressure switch has a third wire which is connected to the fuel pump. The oil pressure gauge may work although the third wire to the pump may be at fault causing your delimma
Once the engines oil pressure reached the normal operating range the computer shuts down the oil switches third wire to the pump and the relay takes over until you shut the emgine off

May 24, 2010 | 1998 Toyota Camry

2 Answers

Fuel pump does not come on. car wont start

Then you must have a wiring problem at the rear tank electrical connector or at the fuel pump.

Fuel Pump & Sender Connector - Description & Operation
The fuel level sensor consists of a float, a wire float arm, and a ceramic resistor card. The position of the float arm indicates the fuel level. The fuel level sensor contains a variable resistor that changes resistance in correspondence with the amount of fuel in the fuel tank. The PCM sends the fuel level information via the Class II circuit to the Instrument Panel (I/P) cluster. This information is used for the I/P fuel gage and the low fuel warning indicator, if applicable. The PCM also monitors the fuel level input for various diagnostics.

CAUTION Fuel Vapors can collect while servicing fuel system parts in enclosed areas such as a trunk. To reduce the risk of fire and increased exposure to vapors: - Use forced air ventilation such as a fan set outside of the trunk. - Plug or cap any fuel system openings in order to reduce fuel vapor formation. - Clean up any spilled fuel immediately. - Avoid sparks and any source of ignition. - Use signs to alert others in the work area that fuel system work is in process.
Removal & Installation

  1. Remove the fuel sender assembly.
  2. Disconnect the fuel pump electrical connector.
  3. Remove the fuel level sensor electrical connector retaining clip.
  4. Disconnect the fuel level sensor electrical connector from under the fuel sender cover.
  5. Remove the fuel level sensor retaining clip.
  6. Squeeze the locking tangs and remove the fuel level sensor.

    Fig. The fuel sender assembly consists of the following major components: fuel tank pressure sensor (1); fuel line fittings (2); fuel tank fuel pump module (3); fuel strainer (4); fuel level sensor (5)
To install:
  1. Install the fuel level sensor.
  2. Install the fuel level sensor retaining clip.
  3. Connect the fuel level sensor electrical connector.
  4. Install the fuel level sensor electrical connector retaining clip.
  5. Connect the fuel pump electrical connector.
  6. Install the fuel sender assembly.

its possible that you need check the next wiring diagrams:


Fig. Engine and Fuel Tank Sensors(c) (2000)


Fig. Fuel Injectors(c) (2000)


Fig. Fuel Pump and Relay(c) (2000)

There are two ways to do this; One: you can find the wire that is behind the brake booster or around the fender on the drivers side near the back. It will be a red wire that has an end on it that looks like a plug, but its not plugged to anything. This is what this wire is for, so you will need to hook 12 volts to it, and you will hear the fuel pump come on. Allow it to run for about 10-15 seconds, and unhook it. The engine should now start & run fine. Second: you can purchase a spray can of carb/choke cleaner at a parts store, remove the air cleaner hose going to the intake/throttle body. Hold the throttle wide open, and spray about 4-5 seconds directly into the throttle body. Move the can back, and start the engine. It will run for a few seconds, and stall again. Repeat this until it runs on its own.

Hope help with this.

Mar 11, 2010 | Cadillac DeVille Cars & Trucks

1 Answer

Fuel Pump wiring

If I understand right, I would say the normal ground for the pump is bad.
"I am guessing the pump uses a ground source to start." well, just the normal ground like for any motor, you have the power wire (gray) to the pump, then the ground wire for pump, does it branch off near the tank and find a ground? Or does it go into the tank connector and then routed back somewhere through the wiring harness? Anyway, it has to go to ground somewhere. You have the wiring right it sounds,. just make a good ground source, or find the original ground and repair it.

Mar 14, 2017 | 1999 GMC Sierra

2 Answers

Fuel pump dosen't come on when I turn the key to on position

Hi..myy name is Keith..and the only thing left is the fuel pump should be located under the hood in a black box..i hope this has helped..if not please write back

Jul 04, 2009 | 1992 Mercury Grand Marquis

1 Answer

Car turns over fine but wont start

I had a similar problem on my car. It turns out that somewhere in my electrical lines the power to my fuel pump corroded. I had to jump power from another key-on fuse to power my fuel pump, because it would have been a real headache to find the problem wire. Have you tried a test light to see if you really don't have power to your fuel pump? Have you even replaced the fuel pump? Your pump might be froze up.If thats the case you will need a new one. I hope this helps. 

Apr 14, 2009 | 1999 Jaguar XK8

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