In tank fuel pump substitute for M35

[2deuce]

I've seen the price of original pumps, and wondered if there was some work around that didn't empty the wallet. They certainly went up in price since I bought my last one.
What pressure and volume did the original put out?
Thanks

 

[simp5782]

I've seen the price of original pumps, and wondered if there was some work around that didn't empty the wallet. They certainly went up in price since I bought my last one.
What pressure and volume did the original put out?
Thanks

I use a 24v Carter vane pump mounted on the firewall in the engine bay. gut the old pump and put a pickup hose on it In the tank.

P4603hD

 

[biscuitwhistler37]

I've read people have used 24v Walbro in tank marine pumps with success, a bit pricier than some but still half price of an original pump. I really like simps idea though, hard to foul a pump out if it's not in the constant fouling grossness that is the deuce fuel cell.

 

[GopherHill]

Of course one could clean the fuel tank every 10 or 20 years. Some of those pumps can be resurrected.

 

[2deuce]

I looked in the tank, and it looks surprisingly clean, it is a 1987 truck, so it's not as old as some. If I remember right I think the pump runs slowly, and makes a lot of noise doing so, but doesn't pump anything. How are they resurrected?

 

[2deuce]

I use a 24v Carter vane pump mounted on the firewall in the engine bay. gut the old pump and put a pickup hose on it In the tank.

P4603hD

I like your idea! Do you have a picture where you mounted it?

 

[fsearls92]

I have a NOS pump in the classifieds if you decide to go original.

 

[GopherHill]

Pull the pump out of the tank. Sometimes screens clog, rivets get loose, connecter hose rots, probably other things I don't know about.

 

[KN6KXR]

Pull the pump and check it out. Mine was filthy but even after cleaning would only run upside down. Since it's really hard to drive the truck that way I needed a new one.

Honestly the stock pump is a crappy design. Why replace it with the same junk? I installed a Walbro for half the price and haven't looked back. Actually I scored it on eBay for like $50 so there's a place to look for a deal. Heck the hoses and fittings cost more (I upgraded to a premium modern hose instead of the hard lines). A good marine diesel pump like the Walbro will last a really long time. The stock one not so much.

 

[fsearls92]

Pull the pump and check it out. Mine was filthy but even after cleaning would only run upside down. Since it's really hard to drive the truck that way I needed a new one.

Honestly the stock pump is a shit design. Why replace it with the same junk? I installed a Walbro for half the price and haven't looked back. Actually I scored it on eBay for like $50 so there's a place to look for a deal. Heck the hoses and fittings cost more (I upgraded to a premium modern hose instead of the hard lines). A good marine diesel pump like the Walbro will last a really long time. The stock one not so much.

This is funny, as the original pumps have been in trucks for 50 plus years. Walbro on their site says their pumps will only last 10-20 years.

 

[Adrok]

Repaired a few stock pumps. A good cleaning solves 80% of problems. The stock design has a LOT of play ( i assume for the variety of fuels used in less than ideal conditions ).
Definitely looking into the Walbro.

Cheers

 

[Jeepsinker]

Fass makes an inline pump ( just pump, no filter setup) that will support these engines and is 24v. Could easily use that with an A3 pickup tube.

 

[msgjd]

somewhere in another thread on here is the actual psi and flow data on the OEM in-tank pump .. IIRC, it is miniscule psi, something like 2 or 3 but is not more than 5 or 6.. On a couple of mine I use a 24v carter inline pump with 10-12psi with no issue for several years, and wired with the in-tank wire..

The multifuels will start and run just fine with an inop pump as long as they don't lose prime.. If they run every day or two you likely will never know the pump is bad.. I can tell you an operational in-tank pump helps immensely with starting a truck that has sat awhile or has an air leak somewhere.. The difference can be cranking 30 seconds before it fires (or fails), versus it firing right up within a second or two

 

[Jeepsinker]

somewhere in another thread on here is the actual psi and flow data on the OEM in-tank pump .. IIRC, it is miniscule psi, something like 2 or 3 but is not more than 5 or 6.. On a couple of mine I use a 24v carter inline pump with 10-12psi with no issue for several years, and wired with the in-tank wire..

The multifuels will start and run just fine with an inop pump as long as they don't lose prime.. If they run every day or two you likely will never know the pump is bad.. I can tell you an operational in-tank pump helps immensely with starting a truck that has sat awhile or has an air leak somewhere.. The difference can be cranking 30 seconds before it fires (or fails), versus it firing right up within a second or two

Yeah, pressure requirement is 4-7 psi, but the volume at that pressure is most important. I'm not familiar with the pump you used, but with 3× the required pressure it likely provides enough volume for proper hydraulic head cooling as well. I see a lot of people use little clicker pumps with 1/4" NPT inlet and outlet, and they just don't understand that it doesn't provide enough volume even if it does supply enough pressure. Can't flow the same volume through a 1/4" and a 1/2" pump at the same pressure.

 

[msgjd]

... I see a lot of people use little clicker pumps with 1/4" NPT inlet and outlet, and they just don't understand that it doesn't provide enough volume even if it does supply enough pressure.

correct! the carter pumps i used are 3/8 flow-thru's so-that the fuel will draw even if fuel pump fails