Question about 1995 Pontiac Grand Am

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Fuel pump quit,replaced it,car was running fine before, now have no fire to plugs,have check all three main componets

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If the coils check out, you might try checking the crank sensor. If this is bad, the car will turn over, but no spark, because it does not know the relation of the pistions.

Posted on May 01, 2010

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I have 1986 Alfa Spider that won't start. Car has been sitting for a year. I replaced battery, fuel tank, fuel sender unit, both fuel pumps. I seems that the in tank pumps is not getting any po


Could be the main or fuel run relay located in the compartment under the luggage rack, passenger side, main relay also, fuse for the fuel relay 8amp. Electronic Control Unit is also located there.

Could be electrical, Hook up a timing light, three leads: Power, Ground, and one that goes around the wire to #1 cyl. Turn the engine over and see if there's firing. Note: u can check all 4 spark plugs this way.

Fuse lead goes to pin 30 of the fuel relay, u can jump 30 across to 57 and check for the pumps running, if not, change-I suggest both relays, main and fuel run relays. Both pumps get their 12v DC from the fuel run relay, both should be running when you switch ignition switch to on, then a tachymetric signal is fed from the coil to the relay to keep it running.

Jun 10, 2012 | 1986 Alfa Romeo Spider

1 Answer

Replaced everything under the sun on our 87 olds delta 88...wont fire on its own but will fire and run fine as long as u shoot it with starter fluid. We replaced starter, fuel pump, filter, plugs, wires,...


Can you here the fuel pump running?no, check fuse,and pump relay. Check pump fuel pressure,at the fuel injector rail,or throttle body. Check for voltage at the top wiring on the fuel nozzel.While cranking look for pulsating voltage.None, test computer,scan system. let me know the outcome.

Aug 30, 2010 | 1987 Oldsmobile Delta 88

1 Answer

Wont start, no spark anywhere


Check the spark, remove the fuse to the fuel pump and remove one of the spark plugs. Connect the plug to its lead and position it well away from the engine against the truck frame (do not hold it) and turn the engine over, check the spark. If no spark it most probably a faulty coil. Check the impedance of the spark plug leads and replace any that are much higher than the rest. My guess is that you have spark but no fuel, What?... OK this is what I think is wrong. Your pump is fine when at position 2 on the ignition switch however when you switch to position three to fire the engine the power to the fuel pump is momentarily disconnected. A leaking fuel pressure regulator or injector would drop the pressure in the fuel line and at the same time flood the engine making it impossible to start. Once you start the engine with ether the ignition is back to position 2 and the pump can make good any loss in pressure but because the intake mix is rich this will cause the engine to run rich too. A good fuel system is capable of delivering 40 - 50PSI of fuel pressure and when switched off up to 90% of this pressure should be maintained for about 5 minutes, if it cannot check out the fuel pressure regulator and injectors. The fuel pipe should be capable of filling a pint pot in about 15 seconds, if it cannot check out the fuel filter is clogged.
Hope the above gives you some pointers

May 21, 2010 | 1998 Chevrolet K3500

2 Answers

Replaced fuel pump. turns over strong but won't


check wireing harnes to fuel pump that yr and model were prone to going bad and causeing fuel pump to kick off and on at wrong time

Nov 16, 2009 | 1996 Chevrolet C1500

2 Answers

89 f150 wont fire


i suspect a fuel pump malfunction. i would check there first. make sure the fuel **** fuse is good and well. check the lines for blockages. after you run the fuel pump/fuse/line test, go to the distributor/coil and test the spark value. i would also check wires as well. your problem should be in one of these specific areas.

Mar 04, 2009 | 1989 Ford F 150

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