skidball

Hello,
Had strong fuel smell from rear of car. Car seemed like there was some type of fuel problem ? Can't really explain right now. Tried hooking up pressure gauge had problems, could not get reading , that's another story. I could be way wrong , but after visual inspection while car running. It looked like the pulsator was leaking fuel ??? I replaced with proper rated fuel line and car idles better and drives stronger . Right or wrong ? Pulsators sitting on work bench, see what happens ? Is there some type of check valve in the fuel system . So far everything seems ok ? Read somewhere here about fuel pressure and check valve ? Yes I don't know. Thank you.

John A. Marker

The check valve is in the fuel pump. If the pulsator was not connect to the lines tight, it could be leaking fuel so your getting little or no pressure to the fuel system. Replace the pulsator with a section about 2" long of high pressure fuel hose that can be submerged in fuel. Use screw clamps to attach the hoses to the fuel tubes in the tank.

Good luck on your Corvette Adventures.

Klondike

I just replaced my fuel pump. The new pump says it is a turbine style pump and does not require the pulsator (like the roots roller bearing type). It came with a piece of fuel hose to replace where the pulsator went.

zr1fred

While its very possible, maybe probable, you have a bad fuel pump, a bad fuel pump will not cause a gas smell. Keep looking. You may have a bad hose or a requlator problem, or even a bad gas cap. The fuel pump is in an a sealed unit, the gas tank.

aklim

Not sure about a regulator since it would suck the gas into the manifold and not throw it out the back where he is smelling it.

Klondike

There is a vent tube that leads to the charcoal canister that comes off the tank where the other fuel lines lines are by the filler neck. Maybe that line has a break in it or is plugged up causing the fumes back there.

Smokeysvette

I've changed many a C4 Fuel pump and yet to reuse the pulsator. I always just go back and replace it with a piece of fuel line hose and have never had a problem eliminating it.

aklim

Maybe a leaking gas cap?

skidball

Thank you !!! Now that you said the regulator may suck gas into intake ? . A light sort of went on . I have checked the injectors numerous times for leakage, and never had any gas at vacuum line on regulator, however , I know it's obvious , But when I open the throttle plates by hand , I know this will sound funny. There is a gas smell from the intake that wound bring elvis back. It could explain so many quirks with the car . I may check it out this weekend.

aklim

The system is batch fired so it will fire 1, 3, 5, 7 all at once regardless of whether it is being used at that instant or in the next few milliseconds. Possibly could be that some gas is unburned at the shutdown. It could also be your injectors leaking. Seeing as how long they haven't been cleaned (no, that does not mean sticking in snake oils in the tank), it could be leaking. Only way to tell is to take it out and have it put on a flow bench to test. Not sure what the years were but if you have Multec, they are crap.

Still, to verify what is going on, see if the system will hold pressure. Turn it to run mode and see what the pressure is and how long it holds.

skidball

The gas smell is finally gone from the back of car, runs better, still more to check out. My backward thinking and I may be wrong ? Is that , if the gas in the tank was being disturbed and or the pulsator was leaking . You would have fumes, I know you will fumes anyway, it's a gas tank, That being a vented cap , and the spill tube on the car. Fumes maybe could happen ? That's my 2 cents.

aklim

When you don't open a bottle of soda and shake it around, do you smell the soda? The pulsator and the gas in the tank is sealed up. Either the vent hose is leaking or it is coming from somewhere else regardless of whether there are elves swimming in your tank or the pulsator is leaking.

skidball

Thank you for your reply. Have a nice day.