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Old 05-17-2019, 09:46 AM   #1 (permalink)
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Default Leaky Manual fuel pump/'87 Samurai JX

Hello,
I bought an '87 Samurai.It ran fine until the original carb choke broke and I replaced the carb with a Weber. It ran nicely for maybe 10 miles,then the manual fuel pump started leaking gas.This pump looked like an original unit. I bought an aftermarket unit from Advance Auto.My mechanic installed it and a few miles it started leaking. My mechanic removed it and installed a NAPA aftermarket unit. It started to leak too-Is the Weber causing this???? I really don't want an electric pump
Help~~
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Old 05-17-2019, 10:17 AM   #2 (permalink)
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Are you sure it's the pump that is leaking? Where are they leaking from? If the pump itself is leaking, I'd say it is/was defective, and the issue is not related to the weber carb.

Having said that, the Weber carbs are known to be sensitive to fuel pressure, and you can have problems with them running rich unless a pressure regulator is used to limit the pressure.
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Old 05-17-2019, 11:44 AM   #3 (permalink)
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Default Leaky fuel pump

Thank you so much for your insight-I vaguely remember reading somewhere about a fuel regulator added to a Weber conversion but I didn't think it was needed 'cause the problem didn't happen when the Weber was installed-
I'll reach out to the tech who installed the Weber and ask him-hope he knows as this would be an easy fix- 1 issue down,10 more to go!
Also-do you think the new pumps are now damaged or with the pressure reduced will they work without leaking???
Thanks again for all of your help-I'm in south Florida and 1st gen Samurai's are
rare and mechanics like to work on new cars, not the old ones :-(
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Old 05-17-2019, 12:37 PM   #4 (permalink)
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If the leak is at the pump, a fuel pressure regulator will not fix that issue...

.... Philip
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Old 05-17-2019, 12:47 PM   #5 (permalink)
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Default Leaky fuel pump

To be honest-the truck has been sitting for 1+ year and I just remember it looked like the gas was coming out from the top of the pump. I guess I should just get it started and then I'll see wxactly where the leaks are coming from.
I did speak to the tech who installed the Weber and he doesn't think it's the Weber.
So much for this issue until I get the truck running again.
I really appreciate all of your help.
It's good to know there are ppl who can help~
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Old 05-17-2019, 02:07 PM   #6 (permalink)
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check the fuel lines carefully, Webers have a hasty habit of leaking right where the hose connector meets the carb body.
Check the hoses are tight as they do expand when warm.

As you have replaced the pump 3 ? times, its not likely all are faulty, your issue is elsewhere.
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Old 05-18-2019, 09:12 AM   #7 (permalink)
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Default Leaky Fuel pump

I know, agree:3 pumps-1 original that worked with the original carb and worked shortly after the Weber was installed,then leaked and then 2 new aftermarket pumps that failed shortly after install-
I'll check all of the Weber lines once I have the rig running
The carb tech (his business is ONLY carbs) didn't think it was the Weber because there were no leaks after his install.He did look at an image of the pump and it does have a fuel return line for excess fuel from the pump going back to the fuel tank and thinks maybe the line has a blockage-but as I remember-the leak doesn't happen immediately. Maybe there is a blockage closer to the fuel tank-and maybe that's why the leaks take a while to develop.
Thanks again to everyone for your help-I'll keep you posted.....
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Old 05-18-2019, 11:52 AM   #8 (permalink)
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remove lines from pump, blow compressed air down both lines to the tank, make sure you can hear air coming from the filler cap. (use someone else for this bit as i doubt your arms are long enough to blow down the lines and listen at the filler at the same time)
Bubbling noises on the pickup, free air on the return usually. Blocked return will certainly over pressurise things and would account for the leaks.
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"Dogs feel very strongly that they should always go with you in the car, in case the need should arise for them to bark violently at nothing right in your ear."
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Old 05-18-2019, 01:21 PM   #9 (permalink)
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Check the hoses, then find someone with a small compressor for the air. If there's a blockage it would be pushed into the tank? I hope there's just a loose hose-simple/done.
Thanks again 2013GV
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Old 05-18-2019, 01:44 PM   #10 (permalink)
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if its blocked, then yep, it should blow back into the tank, you know the pickup / supply line is clear, if it wasn't you wouldn't have fuel. If return is blocked and won't clear, then start tracing lines.
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1971 V8 HG Holden with 383 stroker 9" torq lok and TH350 trans (the toy)
Mitzi RVR 2.0 (not one of my better buys)
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