Question about 1994 Pontiac Trans Sport

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My trans sport start and run without the fuel pump relay why??

Always running without any problem but yesterday don't start quick like every day anyway start after few attempts and ran well for some time, after stop and restart again run some time and engine stop, put in neutral and restart again run well few minutes and again, restart and run well and again 48 times do the same, finally get home, and test all look fine pump make noise when turn key on remove fuel pump relay turn the key on and engine run without relay. surprise i can't find the trouble. my van have 240,000 + miles and still in good shape, in the highway one or two times push the throttle hard in 3rd gear and engine not look lack of power they rev 5500rpm and sustined for some time when release the throttle engine quit.

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  • vmabracho May 09, 2014

    all vacum hoses are new and spark plugs too, no vaccum leak i know



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  • 13 Answers

Check for vacum leak

Posted on May 08, 2014

Testimonial: "tanks no vacum leak engine running well but stop suddenly every time is like when no have gas and restart again wonder if a tired fuel pump may be the problem?"

  • vmabracho May 09, 2014

    "tanks no vacum leak engine running well but stop suddenly every time is like when no have gas and restart again wonder if a tired fuel pump may be the problem?"



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SOURCE: 1995 pontiac transport

hi just fixed a van with the same problem. it was the ignition switch , its on top of the steering coulme. three bolts an a nut an the coulme drop an realy easy axces to get to

Posted on Jan 20, 2009

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SOURCE: 1991 pontiac trans am will start and idle but after 25-2800 rpm'

how about highway driving will it cruse at highway speeds and if you were to step down on it does it bog down ? and does it still have the cats on it ? just a thought..

Posted on Apr 28, 2009

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SOURCE: My Pontiac GTP 3.8 super charged. 10,700 original

Have you ran a diagnostics? What codes did it have, if any. If you are not getting any codes, then it is going to fuel related. If the car is getting codes let me know what they are, and we will see if we can't figure out what the problem is. If there are no codes. I would start by checking fuel pressure. If the fuel pressure is good, have you considered having bad gas?

Posted on Nov 09, 2010

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SOURCE: 1991 Pontaic Trans Sport ,

Replace crank sensor. Just above oil pan between engine and transmission.

Posted on May 11, 2011


I Think Your Problem Is Still With The Fuel Supply,Have You Changed all Fuel Filters,Follow All The Fuel Lines Make Sure There Are No Kinked Fuel Hoses,Some Times You Find Small Filters In The Top Of The Fuel Injectors.
Hope This Helps

Posted on Apr 06, 2013

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1995 trans sport van new fuel pump, won't start

If the pump continued to run after shutting off the car you fuel pump relay was probably staying latched. I would replace the relay as well based on your info. Along with the pump the fuel filter should be replaced too and fuel pressure should be checked. Make sure your ground is good also.

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I own a ssanyong actyon sports pickup, one day the twin curly yellow light turn on, when I send to the mechanic, he diagnose and found out one of the low plug was malfunction, so he change that,but the...

I would have done the repairs in reverse order but used a mechanic with knowledge of the vehicle.
The pump in the tank is the low pressure pump and gets power through what sounds like the faulty relay.
Always use the service manual to determine where the fault lies.
Get power to the pump and then check again. Probably just a blown fuse will stop the pump. The engine will still run and start with a couple of glow plugs out as they are only used when the temperature is very low.

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I changed my fuel pump and filter now it dosnt start the first time only the second

I would check to see if you are losing pressure. You should have constant pressure in the system at all times. A quick thing you may want to try is when you first go to start it don't. Just turn the key to the on position without turning the engine over for about 5 seconds. Then turn the key off. Turn the key back to just the on position again. Turn the key off. then try and start it. Turning the key to just the on position will engage your fuel pump relay for about 5 seconds which in turn will build up fuel pressure. If it starts after you do this the first time you may be losing pressure. You can always put a pressure tester on there and check the prssure while it's not running to see if you lose prssure that way. It should have pressure even when it's not running at all times. I hope this helps and good luck.

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98 z24 parked the car went out next day. Engine turns over but won't start. Ran the fuel pump direct and it runs. Disconicted the battery for 20 minute and stell nothing all fuses good and relays .

if the car runs when you feed the fuel pump directly then you have a fuel pump relay problem,no good or bad connection.if the fuses are good then its possible the relay may not be sending a signal(voltage) out to the pump to run or it is but there`s a wiring problem from the relay to the don`t say how or were you feed the pump.if you feed the pump using the spade connector for the pump feed in the wiring harness under the hood then the problem could be were that wire splices off back to the relay.i don`t think its the pcm not getting the signal while cranking or the check engine light would be on,as the pcm uses this to turn on the fuel relay to turn on the pump.

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What you just did is most of the test. Just check that there is power at the pump. If so, change it (don't forget the filter) Problem is common to most if not all electric pumps.

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Fuel Pump

Check fuel pump relay and take off fuel pump relay. And check connection. Test fuel pump i remeber green wire or green. Putting other side your battery plus connection And hearing nose (sound). Thats simple test your fuel pump test

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1998 Chrysler Concorde Fuel Problem

you need to do a fuel pressure test before replacing the pump

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Fuel pump not working

The pump only runs for 2-10 seconds with the key on and then shuts off if the vehicle doesn't start or isn't tried to start. Are you checking it within this period? The power you are picking up at the sender is for the guage. You also have a relay that controls the pump as well as the oil pressure sensor to make sure you have plenty of oil for the engine to run. Are you positive it is in the fuel system? Let me know.

Jan 05, 2009 | 1992 Pontiac Trans Sport

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