Question about 1990 Ford Aerostar

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Why would the fuel pump relay full and drop before the fuel pump had time to start on a 1990 aerostar 3 L engine.

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All fuel pumps will turn on for 3 about seconds if the key is on and the engine is off. This is normal. When engine is running the pump will stay on

Posted on Nov 18, 2009

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Posted on Jan 02, 2017

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Location of fuel pump relay 1991 ford aerostar 3.0


Its located next to the master cylinder and diagnostic port under the hood, drivers side. There are 3 relays located there. On is AC clutch, EEC, and the fuel pump.

With the AC off put your hand on the relays and turn the ignition on, but not to start. The fuel pump relay will click twice.

credit to bartzan41.

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I have a 1990 Buick regal that does not turn over on first attempt and is sluggish to start.


Just to clarify, cranking is the same thing as turning over.
If it cranks but does not start, you need to check the fuel pressure with a gauge before and after you try to start it.
The pump relay allows the pump to run for 3 seconds before the engine cranks to boost pressure in the line. If the check valve in the pump is bad the pressure will drop off when the engine is not running.

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92 ford aerostar good fuel pressure, plenty of spark, spins like crazy good battery , air intake good but fuel pump runs non stop and engine want start. acts like no run signal being enabled. is there a...


There is a fuel pressure regulator on the fuel rail. It could be bad. To check this pull off the vacuum line and turn the ignition on without trying to start the car. If fuel comes out of the vacuum hose fitting the fuel pressure regulator is bad. Another possibility is a bad fuel pump. Check your fuel preasure. If low or non exisitant replace fuel pump only after checking fuel pressure regulator. Good luck.

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1 Answer

I dropped the fuel tank to drain old gas.I put new gas in and turned engine to start it didnt start. Should I be able to hear fuel pump if it is working?This is for a 1990 ford e-150 van.Also where the is...


Turn the key to the ON position without starting the engine. You should hear the fuel pump running for 5 seconds if working. This primes the gas to the injectors when doing this. If not heard running check the oil pressure switch for the 12 volts needed to run the fuel pump starts there on that harness. When the engine starts and the oil pressure reaches the normal pressure the computer shuts off that circuit and turns on the fuel pump relay to run the pump. The relay stays on till you shut the engine off

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