carb help, Holley dbl pump.
 

sorry if posting in wrong category but you guys seem best at this. OK my problem. i have an 830 dbl pump on my 11.60 street/strip car. when i shut it off it takes a little open throttle and some turning over to start. i have bolted on my quickfuel 1050 (4150) and it will fire instantly, what is going on????
both carbs are almost identical in that they both have the proform main body. and i bought all quickfuel replacement stuff for the 830. IE. metering blocks and bowls. everything else works fine, it is just frustrating to have to spin it over for a few sec. to start. help, please!

Re: carb help, Holley dbl pump.
 

"A little open throttle" opening means too much fuel either leaking , flooding or too rich. Is it hard to start all the time or just on a hot restart ? ---Trevor

Re: carb help, Holley dbl pump.
 

Power valve leaking, booster dripping or float sticking?

Re: carb help, Holley dbl pump.
 

Or has a plugged or blocked idle air bleed....

Re: carb help, Holley dbl pump.
 

bad on hot starts.

no power valves. will check floats again but i have the sight glass and they seem ok

quote
.Or has a plugged or blocked idle air bleed....

where exactly is the idle air bleed located?

Re: carb help, Holley dbl pump.
 

Idle are outside hii speed inside next to the accel pump nozzle

Re: carb help, Holley dbl pump.
 

ok, i will blow them out, thanks

Re: carb help, Holley dbl pump.
 

Just because it has power valve plugs it doesn't mean the gaskets are not leaking. I've fixed a lot of complaints lately because of gasket failure. To check to see if that's the problem fill the bowls to normal level, remove from motor and put on a carb. Fixture to elevate at least 2 inches. Wipe the bottom of the baseplate to make sure it's dry, let it set for a while, recheck to see if it's leaking, if it is it will becoming out the p/v vac. Port in the base plate. Then proceed to disassemble and repair. Caution: With the holley p/v gaskets it's easy to over tighten them and then they trar apart. Not so if they are after market with the teflon coating

hope this help's.....norm

Re: carb help, Holley dbl pump.
 

thanks. thats a good idea, will check that tomorrow.

BTW. i appreciate everyones input, we will fix this issue for sure!

Re: carb help, Holley dbl pump.
 

When housing Holley power valve plugs make sure that the head of the plug is not hitting. The main body there is a boss that sticks up on the main body, grind the casting flash off the plug can use a belt sander, lath or big file. When you take the carb apart inspect the body if it was hitting you should see it on the plug and main body. If it is hiting it keeps the metering block from fully seating on the main body.

Re: carb help, Holley dbl pump.
 

ok, i found whats up, left bowls full last night. today front is empty. now i know where to look. more later....

Re: carb help, Holley dbl pump.
 

If the front throttle blades don't get wet when it sits the primary power valve gasket is leaking.

Re: carb help, Holley dbl pump.
 

I've seen some less than stellar PV gaskets lately, the best ones out there now are some red ones from Quick Fuel. It's the same material they use on their new float bowl and metering block gasket. There used to be some really good blue teflon coated ones, I wish I knew where they came from.

Re: carb help, Holley dbl pump.
 

Jmarkaudio......try braswell carburetors in tucson, az. Part number for teflon coated p/v gasket is 082501..........norm

Re: carb help, Holley dbl pump.
 

looks like I'm going to have to remove it and look more. i took the metering plate off, changed pv. gasket, metering block gasket. same leak, (takes about 10 min to see a measurable diff). took apart again, grinded pv plug, flipped gasket, tried again. same leak. seems to be low on the throttle blade area....

Re: carb help, Holley dbl pump.
 

Put new bowl gasket, float bowl gasket and bowl screw gaskets torque bowl screws to 35 inch pound

Re: carb help, Holley dbl pump.
 

Venturi's warped or metering block, quick check, move sec. Metering block(assumed it's not leaking) to the end having problem redo fill bowl and recheck for leak. If no leak it's the venturi.......mill flat, but recheck for clearance of p/v and stud boss in the area. I
ve had some come thru with "excessive" dichromate/bright zinc that would not let the plate gasket seal to the venturi and it dribbled out the off idle transfer slot in the base plate.

One more item to check, the cast in dowel pins in the metering block maybe bottoming out in their associated holes, place metering block minus gasket against venturi and check end-end and side-side for any "rocking". If there is, drill the holes or grind down the pins to fit the hole depth......

Re: carb help, Holley dbl pump.
 

uggggh. i switched the metering blocks front to rear, rear to front. same leakdown. must be in main body, now what?

Re: carb help, Holley dbl pump.
 

I have not read all the posts..... but if the front throttle blades are too far open, the carb will be sifoned through the transfer slot when the engine shuts off and cools down............

Re: carb help, Holley dbl pump.
 

Keith, find some one with a bridgeport milling machine that can true of the venturi gasket surfaces....any machine shop should be able to do it. When complete recheck metering block pin holes for correct depth.....good luck.

Re: carb help, Holley dbl pump.
 

Steve, read the posts, i think you'll change your mind. The mans carburetor emptys the float bowl just setting on the work bench,
no vacuum being applied at that time. They should not leak out the idle hole or the transfer slot when not in use.

Re: carb help, Holley dbl pump.
 

OK, i fixed it, sort of....
this is what i found, and did. after no success with fixing leak on the car, i took the carb off. i saw that the leak seemed to be coming from the small hole in the left bottom- out to the transfer slots at the butterflies. i painted the main plate surface and took a file to it till i was happy it was straight, drilled out the hole for the metering block pin. put on without a gasket, seemed good, no rock or uneven hitting anywhere. put new gaskets on filled bowl and watched it just drip out of the transfer slots again. ugggh. so i looked at my other quick fuel carb. no hole on this main body. OK, so i taped the hole closed w/ aluminum tape. no more leak, put back on car, no more issues! i would just like to know why this continued to leak and why is it not needed? if it is not needed at all i will prob. go back and epoxy it shut.. thoughts?

Re: carb help, Holley dbl pump.
 

keith, that hole in the venturi hsg. is for holleys timed port vac. system, not in new hsg's such as the 950's. if this application is for a race car "plug" it with some jb weld or a small brass plug, you don't need it. wish i had seen the pic's before as i thought you were using stock metering blocks......good luck.....

Re: carb help, Holley dbl pump.
 

you helped me a great deal, thank you. this is a street/strip car. the hard start thing was driving me batty! i knew we would get it worked out eventually. again to everyone that made any input, I THANK YOU !!!!

Re: carb help, Holley dbl pump.
 

I have a quick fuel metering block 34-4 on my carb.....Same darn thing has been happening.... I have had the carb apart 6 times trying to figure this out....It leaks out of the passenger side front transfer slot....Floods the motor and ruins the oil.....I was going to try my old metering block today....but maybe I can just plug the hole...

Re: carb help, Holley dbl pump.
 

yep, i plugged the hole and flipped the gasket just in case. been working great ever since!

Re: carb help, Holley dbl pump.
 

You can just flip the gasket? I have a few gaskets I'm looking at right now....If I flip one onto the other...three holes are different...I'm gonna go grab a metering block and look at it....I put my stock metering block back on and the leak stopped. Maybe it's in my head but the car doesn't feel as fast....I'm going to the track Saturday.

Re: carb help, Holley dbl pump.
 

yeah, i flipped the gasket, it was a quick fuel gasket, had to poke a new hole for one alignment peg, all other holes stayed same except one at bottom, and i did plug that hole anyway....
if you just want to try it out, i put aluminum tape over that hole on the main body first. that is when the leak stopped.

Re: carb help, Holley dbl pump.
 

we see this alost daily with many of our sytreet /strip customers we switched over to AED Holley small parts a couple of years ago when we saw saw over 90% of Holley's stuff coming from China. very diss heartening when you are selling a Weiand intake manifold labeled machined in USA from a China.