Delayed start up

[VIPER1996]

my 94 cranks over about 3 to 4 times before it fires. Is that normal? If not how do I correct it!

 

[Lee Dove]

Yes, Mine cranks more then that....

 

[Steve-Indy]

Sounds like fuel pressure leak down...may need new fuel pump. Try cycling the key 3 times to full on but do hit starter position...this MAY build fuel pressure...then on 4th try, hit start position...if it then starts faster, ask Tech to check for leak-down. Good luck...and let us know.

 

[JonB]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Steve-Indy:
Sounds like fuel pressure leak down...may need new fuel pump.
<HR></BLOCKQUOTE>


Betcha $10 to $1 that Steve is correct, The proof is the "priming" sequence he discribes, 3-4 "key on, fuel pump buzz" sequences. Start on 4th try.

 

[99 R/T 10]

Fuel pump!!! If you cycle the key two or three times and then it turns over, the fuel pressure is bleeding off. Good luck.

 

[SNAKOIL VA]

I turn the key on in my 93 and I hear the fuel pump crank up. It stops buzzing after a few seconds after it builds up pressure. If I turn off the key, how does that help build fuel pressure?

 

[Jack B]

Attach a fuel pressure gauge at the Schrader valve and verify the pressure at approx 2000 rpm. It should be 50-55 psi, also check it after the car has been shut off. You can also use a scan tool, there is a fuel pump test program embedded in the PCM. I believe the pump maintains a preprogrammed lower pressure level. There has definitely been pressure every time I have have removed the line to the Schrader valve, even, after the car has sat for long time periods.

The fuel pump is $400-500 and is very hard to access on a RT10. I believe flat rate is eight hours. The GTS is simpler, however, a little tricky. It is located inside the gas tank in both cases. There is also the possibility of a bad filter. It is located outside the tank, under the car.

 

[joe117]

Why do you need to cycle the key to get the fuel pump to come to full pressure. Wouldn't it be just the same if you just turned the key to on and waited for the pump to stop?

 

[Chuck Greggs S Arizona ACR]

It is possible that your fuel pump is the problem(as everyone has stated). This has happened to me(at VOI 5), and many others, on Gen I cars. However..........the Gen I cars do start slower than the Gen IIs. The Gen I ECU takes longer to read the signals from the crank and cam sensors, etc., before allowing the engine to fire. My '94 has always started just like yours(even when it was new). My '96, and '99 fires(starts)instantly.

It is a good idea to check out the pump, anyway. Also, the fuel filter should be replaced from time to time.

Chuck G

 

[joe117]

I did an engine swap with a Chevy EFI engine, a 2.8 V6 into an MG Midget. I used a small fuel cell for the gas tank. I didn't put a pump in the tank. I used an in line pump that was made for some EFI European car, can't remember what it was, might have been a SAAB.
Anyway, the question is.... Would it be possible to use some large external EFI type fuel pump on a gen1 Viper to avoid having to do the 8 hour replacement of the stock $400 pump? Who knows the answer?

 

[Jack B]

The pump in bottle (in your tank) is to stop fuel starvation when cornering or accelerating. Any external fuel pump still has to have a pick-up in the tank, therefore, you still have to get into the tank because you cannot get flow thru the old pump line due to the fact it is a pusher.

Go to Summit Racing and look for the the highest volume fuel pump for a 5.0 Mustang. This pump is almost identical to the Viper pump, but, it has higher volume. The pump mounts a bit differently, however, it will work. This will save you about $300 and you will get higher volume. The 12V plug is the same however the polarity is reversed, just reverse the pins.

There are any number of external pumps available in Summit's catalog, however, you still have no pick-up point.

 

[joe117]

Are you sure you can't pull fuel through the pump in the tank?

 

[carguy07]

Not sure if this would apply, but on other makes you can get the same symptoms from leak down caused by sticking fuel injectors. If they are stuck open at all you will not only loose your prime but also wash down the cylinder walls with fuel and cause the car to temporarily flood. Also on some cars if the fuel pump relay dies they have a back up that will send power to the fuel pump when the computer sees the engine turning over. If you hear it prime obviously it's not the relay, but I would not rule out sticking/leaking injectors. I think the spark plugs tend to foul when an injector sticks. Sometimes you can even hear the faulty injector hiss when the engine shuts down, I don't know if this is from the fuel leaking at the injector or from fuel vaporizing on the hot piston. Or like the other posts said the pump may be the culprit. Just my .02.