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Fuel Systems and Drivability / Re: Fuel System Picking up Air

« Last post by JohnnyPopper on October 16, 2026, 07:47:39 pm »

"so it currently has 2 new fuel senders (dorman iirc)"

What does that mean? Internal fuel pumps in the two tanks? If yes, AND a mechanical?

(This doesn't happen very often) Yo bd, that would be 'caps'

If no to the first Q's, just go electric with a pressure regulator. Done and Done!

Fuel Systems and Drivability / Re: Fuel System Picking up Air

« Last post by Scaryfastatx on October 15, 2026, 09:13:41 am »

Quote from: prider5 on July 12, 2026, 06:31:07 pm

It starts up fine, getting 6ish psi at the carb, runs good, no issues. After driving for about 10-15 minutes, it starts to starve for fuel. It usually won't completely die if I use very little throttle, but the pressure drops to 0-1 and I can see that the clear filter near the carb is emptying of fuel. Initially I thought it was vapor lock (even though it felt like it was happening very quickly to be that), so I rerouted the fuel lines away from heat. I also replaced the pump because it was weeping, still have the issue.

sounds like you are having similar issues to me with a weak pump. Cold it was fine, but then as the engine warmed it the pump started to thermally expand and it started pumping very little. Curious what brand/pn pump you have?

Fuel Systems and Drivability / Re: Quality OE Fuel pumps?

« Last post by Scaryfastatx on October 15, 2026, 09:10:47 am »

Quote from: Mr Diesel on October 14, 2026, 09:30:04 pm

Can you open them up and find the points of failure? Multiple pumps doing this points to a likely problem elsewhere, unless you can pinpoint the reason for failure.

Last one that failed on me was a plastic pivot piece inside. China part. Replaced it with a Carter that was metal components instead. A carburetor requires very little pump pressure so your failure inside the pump should be pretty obvious.

I agree with your take, but it has a new filter in the carb, a recently replaced the sock in the tank and at the same time I replaced the lines
when it first broke down I thought for sure it was the carb filter again, but no luck.

I havent opened them up, but put gauges on them and was manually pumping to check pressures

seems like most either have a weak diaphragm/inlet-outlet reed valves or are missing the return orifice

the Carter was only pumping 4psi with the return blocked off

One of the Delphi pumps was producing 7psi with the return blocked, but with the return open it was just pouring fuel back into my container.

I used fuel compatible clear tubing so I could see where the fuel was going.

Fuel Systems and Drivability / Re: Quality OE Fuel pumps?

« Last post by Mr Diesel on October 14, 2026, 09:30:04 pm »

Can you open them up and find the points of failure? Multiple pumps doing this points to a likely problem elsewhere, unless you can pinpoint the reason for failure.

Last one that failed on me was a plastic pivot piece inside. China part. Replaced it with a Carter that was metal components instead. A carburetor requires very little pump pressure so your failure inside the pump should be pretty obvious.

Fuel Systems and Drivability / Re: Quality OE Fuel pumps?

« Last post by Scaryfastatx on October 14, 2026, 06:16:44 pm »

WELP!

the latest carter M6266 just died after 3 days
2 trips to work, and half a trip to the grocery store...

I've been testing the Delphi ones, and one of them with the return port plugged seems like it might work

Thinking about putting an in line orifice or maybe scavenging the orifice off of the M6266

Also thought maybe turning down some 0.060" jets and shoving them into the return hose

Fuel Systems and Drivability / Re: Quality OE Fuel pumps?

« Last post by Mr Diesel on October 09, 2026, 03:09:08 pm »

Garbage aftermarket. I could keep my old junk running forever if there was just some decent replacement repair parts.

I avoid anything stamped in China. Best option is usually Taiwan, followed probably by Mexico, U.S., and any other country besides China.

Fuel Systems and Drivability / Re: Quality OE Fuel pumps?

« Last post by Scaryfastatx on October 09, 2026, 09:53:19 am »

Yeah, it's mechanical

So 3 Delphi, none of them had an orifice on the return bung, one of them worked for 30-45 minutes before it lost enough pumping capacity due to the full flow return

I didn't notice it didn't have the orifice was missing until I pulled it off

Also noticed the dreaded A stamped on the, so I guess Delphi white labels through Airtex