Stromberg 97 problem

[Charles Seims]

I hope some of you guys can give me some sound advice here. Engine is a stock recently rebilt 21 stud with a single 97 carb. Car doesn't get driven much. Has been running poorly, stalling out instead of idling. I found the carb was far out of adjustment (don't know how that happened, I certainly didn't do it). While I was trying to adjust the idle I noticed gas on top of the carb. Not good. About every 5 to ten seconds there was a tiny spurt of gas coming out of the hole for the accelerator pump piston shaft. I took the carb apart and compared it with the rebuild kit instructions I had saved from several years ago. The exploded view in these instructions shows a single small spring (9640) on the piston shaft. Using this diagram, this was the way I set it up when I rebuilt the carb. The carb work okay for several years. But because I wanted a better diagram, I consulted the green bible which indicated that there should actually be TWO springs on the piston shaft, the small 9640 and a much larger lower spring (9636) plus some attaching hardware. I found the missing hardware in my old parts can and reassembled the carb using a brand new accelerator pump piston and both springs as shown in the green bible. The 9634 felt washer at the top was brand new also. I cleaned the carb and blew out all passages with compressed air before reassembly.

Bottom line here is that the rebuilt carb is STILL spurting gas out the hole at the top of the carb horn, and I am afraid to drive the car. I've done everything I can think of to do. Can anybody suggest a fix?

I should mention I use a Grose Jet for the inlet valve, but that shouldn't make any difference.

 

[koates]

Have you checked the fuel pump pressure ? Should be approx. 2.5 PSI. with engine running. Anything over 3 PSI could cause carb to flood. Regards, Kevin.

 

[Charles Seims]

I should mention that I checked the level of gas in the bowl and it was about 15/32nds below the top of the bowl. Could this be a problem?

 

[G.M.]

Check the float valve. G.M.

 

[Bored&Stroked]

Is it squirting/leaking just when it is sitting and idling/running - or when you use the accel pump and as the plunger is going down - it is squirting back up?

 

[phoenix5x]

Couple good suggestions here..I am certainly no expert but if thise couple suggestions don't pan out give Charlie Price a call from vintage speed...one of the most knowledgable carb setup guy I know on the east coast..he will be more than happy to speak to you on the phone

Sent from my VS995 using Tapatalk

 

[drolston]

Did the recent rebuild include a rebuilt fuel pump? Sounds like fuel pressure is too high. If that is not the problem, replace the float valve and lower the float setting to the lower end of the range (17/32) versus the high end where you have it.

 

[6lucky13]

I thought I would relay my experience with the accelerator pump in the 97 carb. I rebuilt my carb with all new parts (needed a new power jet due to a twisted gasket which broke a sliver off and clogged the orifice) and after a couple hundred miles, I had the same problem as that described but gas was squirting out the top of the accelerator pump at idle and while running. Luckily, I was not far from home. I checked all the usual items such as float level and needle and seat valve. I did not check fuel pressure. I decided to check the accelerator pump assembly. The pump on the right is from the leaking carb; the one on the left is a spare I had. It’s difficult to see with out-of-focus image, but the needle wasn’t seating in the orifice on the right pump. I replaced it with the one on the left and everything fine still after about 1200 miles. Not saying this is the problem Charles is having, but I would carefully check the pump again.