my vortec v6 (95) only will start when it is primed with gas pored in the manifold. When started, runs good.?

Question

A mechanic I know who is certified for over 30 years says it runs to smooth to be a fuel pump or regulator. He said it could be the spyder fuel injector. Does anybody have any experince with them?

Answer 1

The fuel system pressure is leaking down.

1) Could be the fuel pressure regulator.

2) Could be the check valve in the fuel pump.

3) The real question is why the fuel pump isn't re-pressurizing the system when you turn the key on.
Try turning the key to the 'on' position and listen for the fuel pump to run for a couple of seconds then shut off. If you cannot or do not hear it, check the fuel pump relay.
You can have someone turn the key while you check that the relay picks up when they turn the key on. If it does not pick-up, change the relay, they are less than $10.
Again; it should pick-up and then stop after a couple of seconds, this circuit pressurizes the fuel system prior to start.

4) The fuel pump will run without the relay, when the oil pressure reaches 4-6psi the oil pressure sensor will start the fuel pump. The starter turning the motor will sometimes provide this much oil pressure. So, if you have noticed the car has to be cranked a while, then starts, the problem is most likely the fuel pump relay or that circuit.
In your case, You are priming the engine so the engine starts long enough that the oil pressure sensor sees the engine has oil pressure and starts the fuel pump.

I'll bet it is the fuel pump relay.

my $0.02
Yours: Grumpy

Answer 2

Dodgeman is right. The injector in your van is actually a cross between multiport and throttle body type injectors. It has one injector that sends fuel to six poppet valves, one at each intake port. If the system does not operate properly, you will need a technician to diagnose to determine what is faulty. I suspect you'll find that the temperature sender or the crank position sensor are the root of your problem but again, a technician will need to hook up with a scantool and read your engine's data stream to get the real facts. Good luck with this.

Answer 3

if your Friend says he has 30 years experience and don't know ?then what is his experience then ?need to run a no start test, step buy step by the book, and you have a fuel delivery syndrome, and need test equipment to properly diagnose this no guessing it over the net, take to the dealer and or a good repair shop one that knows how to fix cars, also if you want me to guess its a cold start injector, and or its censer to the computer does not know the engine stats good luck

Answer 4

Had one that did the same turned out to be the fuel pump. Check fuel presure, and the regulator.

Answer 5

It sounds like the cpi (spider). One thing to check. Remove the center spark plug on the passenger side. If it is wet with gas, the cpi is leaking. Make sure the two nylon feed lines are also replaced they tend to crack too.

Answer 6

trust your mechanic friend, he is right, the tips of the injectors plug up from some chemicals in gasoline, once the engine starts this plug falls off untill u let the engine sit for awhile again.

Answer 7

a fuel pressure guage reading would help .should hold steady when cranking ,if it drops pump could be it.

Answer 8

yes i do,, i own a repair shop in Tennessee,,and he is telling you right they will do that ,,but run good after they have been started,,you will have to get it repaired though,,because you cant keep priming it up,,all the time,,good luck with it,,i hope this help,s.

Answer 9

just call it spider hell and squeal alot --commmon if you have fuel pressure -its oh **** -spider went south