This weekend at the NOPI NJ race when I would get to the end of the run and hit the brakes my fuel pressure would drop to 0, car would go lean, and I could hear the noise of the pump change like it was getting starved for fuel. A few times the car would shut off but once I was able to keep it running. After it would shut off I was able to get the car started again.

On my last run the car did the same thing dropped to 0 and shut off b/c of no fuel. I turned the key on and off a few times and could not build pressure. Back in the pits we changed the FPR and still no pressure. I then took the line off at the fuel filter by the injectors and tried to prime the system and still no fuel. I then took the line off of the “OUT” side of the pump primed it a few times and fuel finally came out. So I am assuming the pump had gotten a vapor lock in it.

I was wondering if other people are experiencing this problem or if it is just myself? When I had the sump installed I had them drill about 5 or 6 holes to act as a baffle to keep the gas in the sump.

Any help or suggestions on how to eliminate this problem would be great because this cannot be good for my motor or the fuel pump.

Thanks

 

how much gas do you keep in the car?

 

Make sure you have a decent amount of gas in the car or build a new sump with a one way door (like the moroso oil pans)

 

I run about a half a tank or more.

 

How did they drill the holes. They should be done such that the lagrer holes are to the rear of the tank....

Here is mine for example....

 

Also, I made my own sump....

It is like the Full-Race unit, but it lower profile at the front side of the tank so that less fuel goes forward during braking.

 

Again, this is the way Scott and I do it (and have never had a problem with getting fuel the pump under accelerating or braking - as we have in the past with different style pick-ups)... Pics should be pretty self-explanatory!

Clean via sanding disk...


Cut a huge "hole" in the top to remove stupid OE factory anti-slosh tray, etc.


Randomly drill holes wherever... j/k. We normally place them more towards the front of the sump.


And the only pic I have where you can kind of see the sump.

 

nice fuel pump. how is that working for you ?

 

We've used them on the past few SFWD cars we've built and haven't had any problems thus far... Everything else hasn't been able to hold dead solid. And we haven't worked with the big Weldons much though, but I figure they'd do about the same as the Mags.

 

just bought one from Full-Race...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kataku2K3 &raquo;</TD></TR><TR><TD CLASS="quote">

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Good god... that is a nice setup. Pretty expensive too. Nicely done.

 

I would be concerned with the weight of the pump and it's mounting bracket.... It will be taking a beating off the line and all the way down the track.

 

mine does the same,just make sure the car has aleast half tank of fuel,i also drilled a hole in my gas cap to vent.i think this helps so there is no vapor lock and the pump is a pusher and not a puller so it should be able to be vented.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by swapit &raquo;</TD></TR><TR><TD CLASS="quote">mine does the same,just make sure the car has aleast half tank of fuel,i also drilled a hole in my gas cap to vent.i think this helps so there is no vapor lock and the pump is a pusher and not a puller so it should be able to be vented.</TD></TR></TABLE>

That was the first thing I tried to do was I took the gas cap off but it would not get rid of the vapor lock.

I am running the weld 2015A not sure if that makes a difference

 

Put a shirt on Chad!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boostfed.com &raquo;</TD></TR><TR><TD CLASS="quote">Put a shirt on Chad! </TD></TR></TABLE>

im bringin the needle-nose vice-grips for next weekend

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tepid1 &raquo;</TD></TR><TR><TD CLASS="quote">I would be concerned with the weight of the pump and it's mounting bracket.... It will be taking a beating off the line and all the way down the track.</TD></TR></TABLE>

Not to get any further off topic or anything, but you're right. Our brackets/bolts are taking a good load when going down the track, but again, we've never had a problem with anything breaking. They're pretty beefy bolts, run through decent wall, 0.50" tubing, capped with washers... You can hang on the pump, and it won't really move (pulling from center). And of course there's plenty of other ways that it could be mounted, but we are insanely picky about looks (and it needs to be that low, 'cause the pumps don't "suck" too well).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kataku2K3 &raquo;</TD></TR><TR><TD CLASS="quote">

And of course there's plenty of other ways that it could be mounted, but we are insanely picky about looks (and it needs to be that low, 'cause the pumps don't "suck" too well). </TD></TR></TABLE>

With that being said.... Chad how low is your fuel pump? It should be level with your sump outlet or even lower. Is it? Got any pics of your setup?

 

It is mounted fairly high up. I will try and take some pics tonight.

 

thats the way im going to do mine. thanks for the great pic man!

 

Use some fuel cell foam. I had the same problem because I'm using the Aeromotive Pro pump and that pump moves a ton of fuel . When I had less than a 1/2 tank I would starve the fuel pump when the car accelerated or braked. Now I can have 1/4 tank with no problems. If it's a Civic fuel tank buy enough foam for a 10 gallon fuel cell and cut them in large enough squares and sqeeze them in the old fuel pump access hole until the foam tops off. Remember when you are racing and there is a 1/2 tank of fuel in there........thats 5 gallons of fuel that can catch fire if anything happens.......(knocking on wood). I'd rather have 1/4 than 1/2 tank.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by underpressure02 &raquo;</TD></TR><TR><TD CLASS="quote">It is mounted fairly high up. I will try and take some pics tonight. </TD></TR></TABLE>

That might be the problem.... get that bad boy lower. It is not a puller pump....

 

I have the same problem with my full race sump. when I brake, I can hear my pump dying and sound like pump is not getting any fuel. It happens all the time, it doent matter if I have full tank or 1/2 tank.

I was gonna sell my complete fuel system and just cut the tank top of the tank and install 2 255 walboros. I hate the ******* loud pump.

Can some explain how I can have my car shut off or have my boost stay down if pump fails. I run Neptune RTP with quad stage boost controller.

 

If you are really crafty you could rig up a hobbs (pressure activated switch) switch that would cut power to the ignition box when fuel pressure dropped below a preset point.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbocivic94 &raquo;</TD></TR><TR><TD CLASS="quote">I have the same problem with my full race sump. when I brake, I can hear my pump dying and sound like pump is not getting any fuel. It happens all the time, it doent matter if I have full tank or 1/2 tank.

I was gonna sell my complete fuel system and just cut the tank top of the tank and install 2 255 walboros. I hate the ******* loud pump.

Can some explain how I can have my car shut off or have my boost stay down if pump fails. I run Neptune RTP with quad stage boost controller.</TD></TR></TABLE>

How is your fuel pump mounted? If I remember correctly isn't yours mounted pretty low?

Also with the foam what will that help do? Will that help the gas from sloshing around?