Long start
Thread Starter
Cruising
Joined: Aug 2010
Posts: 12
Likes: 0
Long start
Hello,hope some one can help.
94 vette was getting a long start
replaced the fuel pump, i was getting no
pressure on the old one. new one in cranked
right up.Took it home sat for a few, went to
start same thing long start but it does start.I think i
replaced the fuel pump relay. At least it is where i
think it is located,under the dash on driver side.( it is
on a block of 4 other relays ?).
Thanks for any help.
94 vette was getting a long start
replaced the fuel pump, i was getting no
pressure on the old one. new one in cranked
right up.Took it home sat for a few, went to
start same thing long start but it does start.I think i
replaced the fuel pump relay. At least it is where i
think it is located,under the dash on driver side.( it is
on a block of 4 other relays ?).
Thanks for any help.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
You should check the fuel pressure. Key on. Running. Key off.
Usually a long start is caused by the fuel pump relay not energizing. The oil pressure switch has to take over. It takes several seconds to build up enough oil pressure for it to turn on the fuel pump.
Usually a long start is caused by the fuel pump relay not energizing. The oil pressure switch has to take over. It takes several seconds to build up enough oil pressure for it to turn on the fuel pump.
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
Check the fuel pressure regular (FPR). It and cause a long start if it is leaking fuel back into the manifold (from vacuum line) loading it up with fuel. It may also cause your loss in holding fuel pressure.
Pull off the vacuum line and see if it is wet. Turn key on and see if fuel comes out of FPR.
Pull off the vacuum line and see if it is wet. Turn key on and see if fuel comes out of FPR.
Drifting
Joined: Nov 1999
Posts: 1,502
Likes: 12
From: Yorktown Heights NY
You have a leak somewhere. After key on pressure should hold.
Could be bad ball check valve in new pump, fp regulator, pulse damper between pump and outlet tube in tank assembly......need to troubleshoot
Could be bad ball check valve in new pump, fp regulator, pulse damper between pump and outlet tube in tank assembly......need to troubleshoot
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Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
I believe your fuel pressure should be around 40 PSI. It sure sounds like there is something wrong with it, either mechanically or it's the wrong model for your application.
Le Mans Master
Joined: Jan 2006
Posts: 5,620
Likes: 206
From: Orlando FL
I think you need to pull the pump out and revisit your installation. There could be a broken hose or bad connection letting fuel out back into the tank. The pulse dampener might also be broken, cracked or blocked causing poor fuel flow. But if the pulser was only blocked, it probably would not cause fuel pressure to bleed off so fast. Sounds like you covered everything topside of the engine.
Time to go in the tank again.
Got faith in your fuel pressure gauge reading??
Time to go in the tank again.
Got faith in your fuel pressure gauge reading??
